Tk is an excellent GUI system for building Perl apps on Windows.

I've got Nancy Walsh's book, "Learning Perl/Tk" from O'Reilly and I recommend it if you're the book type. Otherwise, I'd skip it. Her book is pretty good, but it's dated. And her style does not match the module author's style very much.

The single best source of good examples of Tk code come bundled with the Tk800 module. Once installed, you can type "widget" from a DOS prompt and get an interactive demo of all kinds of features of the module with easily viewed code for the examples. It doesn't get better than that.

The Tk perldocs are so-so in many places, but I've used the widget demo to get me past some sticky spots before. It's very handy.