I've developed a few apps with Gtk and perl. True, the documentation is, umm, lacking to say the least. True, the widget packing is not as nice as some others. BUT, it is fairly easy to build GUI apps quickly, the perl interface is intuitive (if you know some GTK).

You can use a simple cartesian placement system with GTKTable, BTW. It lets you lay out widgets sort of like graph paper.

Also, Sams Teach Yourself GTK+ Programming in 21 Days by Donna Martin is quite useful. It is a book for GTK in C, but if you look at the perl examples in the tutorial , you should have no trouble translating. It is not complete (it is only "21 days", after all), but does a great job helping one get started. [Disclaimer: Donna's a friend and I'm mentioned in the Acknowledgments.]

--john