One possible source of memory leaks in Perl when using Tk is that Perl never free()s anonymous subroutines. I suspect this will be fixed in Perl 5.8.

I had a simple Tk application that leaked memory and I changed it to use smart named subroutines instead of passing lots of anonymous subroutines to Tk and the leak went away.

        - tye (but my friends call me "Tye")