As you're new to Perl/Tk, here's some resources you'll probably find useful:

• Documentation for Tk Modules.
• Documentation for User Contributed Tk Modules.
• The book Mastering Perl/Tklink removed - see below is online.
• The widget demo which comes with the Tk distribution: just type widget on the commandline.

Update:

I had included a link to an online version of Mastering Perl/Tk. It was pointed out to me that this was a pirated copy so the link has been removed. This book is published by O'Reilly. They have a page with details of Mastering Perl/Tk - this includes a link to Safari Books Online which you can follow from their site.