I haven't done much with Perl/Tk though I have bought and reviewed
Mastering Perl/Tk. There seems to be a concensus from most people I've talked with that you should skip the earlier O'Reilly book
Learning Perl/Tk.
lemming replied in my review thread and gave a link to online
program examples from the book.
dreadpiratepeter also did a
review.
If you haven't already, you might also want to check out the Demos that came with Tk.pm located in something like C:\Perl\site\lib\Tk\demos if you are using ActiveState Perl (and used the standard install directories).
--Jim