> Last but not least, there is the Fox GUI toolkit, too (which recently
> got a book published aimed at people who haven't created a GUI
> application yet, too).

Also, depending on your application, a web-based GUI developed using
Rails for example, might be sufficient. At least this way you don't
have to worry about updating the application on the users' machines,
and it (partly) solves the cross-platform issue.

Chris