programming - GUI toolkits

Hopefully somebody else is pondering this as well...
What are the best GUI toolkits? And which toolkit typically makes sense for which type of application? Here's my list so far, please comment:
QT by trolltech, relatively expensive cross-platfoom toolkit.
http://www.wxwindows.org/ and
http://www.fltk.org/ , free C++ toolkits.
Java toolkits Swing
and SWT, swing is slow, SWT is used in popular Eclipse.
Web: Ajax
and Flash ( http://www.openlaszlo.org/ )

Ofcourse there are the windows
http://www.msdn.com
and
now C# sharpdevelop and MS c# tools.

Comment on what toolkit are you leaning towards? given freedom to choose(obviously not common in most bigger organizations).