Here is a list of user-visible changes in Qt from 1.33 to 1.40.  

Qt 1.40 supports drag and drop, with a simple, platform independent
API. There are eleven new widget classes in 1.40. Asynchronous I/O
support is now in the official Qt API.

Since Qt no longer supports any platforms that only supports 8.3
format file names, the file names of the Qt source and include files
have been made simpler.  #include <qcombobox.h> instead of qcombo.h,
etc.  The old names are still present for compatibility.

The new Qt Xt/Motif Extension allows Qt widgets and applications to
coexist with old Xt/Motif-based applications and widgets.

There are more than one hundred new functions added to existing
classes and, as usual, we fixed some bugs, made some more speedups,
and improved the documentation.


****************************************************************************
* 			     New classes				   *
****************************************************************************

* New widgets

  QHeader	- Table header
  QListView	- Multicolun listview/treeview
  QMainWindow	- Application main window
  QScrollView	- Scrolling area (successor of QwViewPort)
  QSpinBox	- Spin button 
  QSplitter	- Paned window
  QStatusBar	- Status bar
  QToolBar	- Container for tool buttons (and other widgets)
  QToolButton	- Fancy push button with auto-raise
  QWhatsThis	- Light weight help system
  QWidgetStack	- Stack of widgets

* Support classes

  QFileIconProvider	- Provides icons for the file dialog
  QIconSet		- Set of icons for different states
  QListViewItem		- Content of a QListView 
  QCheckListItem	- Checkable list view item

* Drag and drop related classes
  
  QDragObject
  QStoredDrag
  QTextDrag
  QImageDrag
  QDragManager
  QDropSite

* Asynchronous I/O

  QAsyncIO
  QDataPump
  QDataSink
  QDataSource
  QDataStream
  QIODeviceSource
  QImageConsumer
  QImageDecoder
  QImageFormat
  QImageFormatType


* New Events
 
  QShowEvent 
  QHideEvent 
  QDragMoveEvent 
  QDragEnterEvent
  QDragResponseEvent 
  QDragLeaveEvent 
  QDropEvent 
  QChildEvent 


****************************************************************************
*		       Enhancements from 1.33 to 1.40			   *
****************************************************************************

The file and print dialogs are far better.

Layouts will now automatically readjust if child widgets change 
maximum/minimum sizes, or are deleted.

QFont now supports KOI8R

The reference documentation of the extensions is now integrated with
the main reference documentation in the qt/html directory.

****************************************************************************
*               Changes that might affect runtime behavior                 *
****************************************************************************

None known.
 

****************************************************************************
*               Changes that might generate compile errors                 *
*                        when compiling old code                           *
****************************************************************************

none

****************************************************************************
*               Type changes that might generate warnings:                 *
****************************************************************************

none

****************************************************************************
* 			Deprecated functions				   *
****************************************************************************
Old function:			Replaced by:
-------------			-----------
QPixmap::isOptimized		QPixmap::optimization
QPixmap::optimize		QPixmap::setOptimization
QPixmap::isGloballyOptimized    QPixmap::defaultOptimization
QPixmap::optimizeGlobally	QPixmap::setDefaultOptimization


****************************************************************************
*      New global functions
****************************************************************************

 bitBlt( QImage* dst, int dx, int dy, const QImage* src,
         int, int, int, int, int conversion_flags );

 bitBlt( QPaintDevice *dst, int, int, const QImage* src,
	 int, int, int, int, int conversion_flags );

****************************************************************************
*      New public/protected functions added to existing classes            *
****************************************************************************

QApplication::sendPostedEvents( QObject *receiver, int event_type ) [static]

QButton::setDown()
QButton::toggle()
 
QButtonGroup::setButton( int id )
QButtonGroup::buttonToggled( bool on )
 
QComboBox::setListBox( QListBox * )
QComboBox::listBox() 

QComboBox::setAutoCompletion( bool )
QComboBox::autoCompletion() 

QComboBox::clearEdit()
QComboBox::setEditText( const char * )

QDict::resize()

QDir::drives() [static]
QDir::remove()

QFileDialog::getExistingDirectory() [static]
QFileDialog::setIconProvider() [static]
QFileDialog::iconProvider() [static]
QFileDialog::setSelection( const char* )
QFileDialog::setMode( Mode )
QFileDialog::mode() 
QFileDialog::setFilter( const char * )
QFileDialog::setFilters( const char ** )
QFileDialog::setFilters( const QStrList & )
QFileDialog::addWidgets( QLabel *, QWidget *, QPushButton * ) [protected]

QFont::isCopyOf( const QFont & ) 

QFontMetrics::minLeftBearing() 
QFontMetrics::minRightBearing() 
QFontMetrics::inFont(char)	
QFontMetrics::leftBearing(char) 
QFontMetrics::rightBearing(char) 
QFontMetrics::boundingRect( int x, int y, int w, int h, int flags,
      			    const char *str, int, int, int *, char ** ) 
QFontMetrics::size( int flags, char *str, int, int, int *, char ** ) 

QFrame::margin()
QFrame::setMargin( int )

QGManager::unFreeze()
QGManager::remove( QWidget *w )
QGManager::setName( QChain *, const char * )

QGridLayout::numRows()
QGridLayout::numCols()
QGridLayout::expand( int rows, int cols )


QImage::copy(int x, int y, int w, int h, int conversion_flags=0) 
QImage::copy(QRect&)	
QImage::allGray() 
QImage::isGrayscale() 
QImage::convertDepthWithPalette( int, QRgb* p, int pc, int cf=0 ) 
QImage::smoothScale(int width, int height) 
QImage::loadFromData( QByteArray data, const char *format=0 )

QIntDict::resize()

QLabel::clear()
 
QLCDNumber::sizeHint() const

QLineEdit::setEnabled( bool )
QLineEdit::setFont( const QFont & )
QLineEdit::setSelection( int, int )
QLineEdit::setCursorPosition( int )
QLineEdit::cursorPosition() const
QLineEdit::validateAndSet( const char *, int, int, int )
QLineEdit::insert( const char * )
QLineEdit::clear()
QLineEdit::repaintArea( int, int ) [protected]
 
QListBox::setFixedVisibleLines( int lines )
QListBox::sizeHint()
QListBox::ensureCurrentVisible( int )

QMenuData::insertItem( const char *text,
		       const QObject *receiver, const char *member,
		       int accel, int id, int index = -1 )
QMenuData::insertItem( const QPixmap &pixmap,
    		       const QObject *receiver, const char *member,
    		       int accel, int id, int index = -1 )
QMenuData::insertItem( const QPixmap &pixmap, const char *text,
    		       const QObject *receiver, const char *member,
    		       int accel, int id, int index = -1 )
QMenuData::findItem( int id, QMenuData ** parent )

 
QMovie::QMovie(QDataSource*, int bufsize=1024)
 
QMultiLineEdit::setFixedVisibleLines( int lines )

QObject::tr( const char * ) 
QObject::name( const char * defaultName )

QPainter::QPainter( const QPaintDevice *, const QWidget * )
QPainter::begin( const QPaintDevice *, const QWidget * )
QPainter::xForm( const QPointArray &, int index, int npoints )
QPainter::xFormDev( const QPointArray &, int index, int npoints )
QPainter::drawImage()
QPainter::drawTiledPixmap()
QPainter::drawPicture( const QPicture & )
 
QPalette::isCopyOf( const QPalette & )

QPixmap::loadFromData( QByteArray data,
		      const char *,
		      int )
QPixmap::optimization()
QPixmap::setOptimization( Optimization )
QPixmap::defaultOptimization()
QPixmap::setDefaultOptimization( Optimization )

QPopupMenu::exec( const QPoint &, int )
QPopupMenu::aboutToShow()

QPrinter::setPageOrder( PageOrder )
QPrinter::pageOrder() 
QPrinter::setColorMode( ColorMode )
QPrinter::colorMode() 

QPtrDict::resize()
 
QPushButton::setIsMenuButton( bool )
QPushButton::isMenuButton()

QRegion::QRegion( int x, int y, int w, int h, RegionType = Rectangle )
QRegion::boundingRect() 
QRegion::rects()
 
QSize::expandedTo()
QSize::boundedTo()

QWidget::isEnabledTo(QWidget*) 
QWidget::isEnabledToTLW() 
QWidget::fontPropagation() 
QWidget::setFontPropagation( PropagationMode )
QWidget::palettePropagation() 
QWidget::setPalettePropagation( PropagationMode )
QWidget::isVisibleTo(QWidget*) 
QWidget::setAcceptDrops( bool on )
QWidget::acceptDrops()
QWidget::focusData() [protected]