Cross-platform GUI development

[psaffrey at googlemail.com]

I've been programming in Python for 5 or more years now and whenever I
want a quick-n-dirty GUI, I use Tkinter. This is partly because it's
the first toolkit I learnt, but also because it's part of the standard
Python distribution and therefore easy to get Python apps to work
cross platform - it usually requires almost no porting effort.

However, when I need a little bit more grunt, I tend to turn to Tix,
which I thought was also fairly standard. However, this week, I wrote
a Tix application under Linux which I'd really like to work on Mac OS
and it's proving fairly painful to get it going. There is no Tix in
the standard fink or apt repositories and when I download a tar-ball,
it wouldn't build because it had a lot of unmet dependencies. I then
read a post which said that only Tkinter/Python people really use Tix
anymore and people in tcl/tk moved onto better toolkits long ago.

My question is if Tix is old hat, what is the GUI toolkit I *should*
be using for quick-n-dirty cross platform GUI development? I guess
this is tangentially related to:

http://groups.google.com/group/comp.lang.python/browse_thread/thread/2ed58ff6ac7d030c/42ed0d40ffd0b1c0?lnk=gst&q=tix+#42ed0d40ffd0b1c0

I hope this isn't a stupid question. I'm wearing flame retardant
underwear.

Peter