My experience has been that Tk is the most stable and portable of the GUI's available in Perl. Wx is a wrapper for WxWIndows, you need to install it directly on Windows as there is no PPM for it.

I have done a handful of small tools in Tk and just recently a much alrger stand-alone application using an MySQL database (or optionally Postgres). I wrote it on Windoes under ArtiveState 5.8.0 and tested it without changes on 5.6.1 on Linus using MySQL. It has now been used with no modification on Linux, Solaris, HP-UX, OS-X, Windows XP, 200 and NT4 with Postgres being used on a linux machine. Now, that is what I call true portability.

Tk is more cumbersome to write as we don't yet have the GUI interface builders. It has a wonderful range of widgets and you can easily customise your own or build mega-widgets. Wx looks nice, but I couldn't get it working on my Linux development box. Prima is nice and worked first time on my Windows machine, but was flaky under Linux. Ad mittedly I had little time to mess around, Tk worked and so I stuck with it. GTK/GTK2 I have not tried, purely through lack of time!

jdtoronto