I know about Fwink from back when I used to use Windows more than any other OS... it was one of the first webcam programs I found for Win32 that aren't instant messengers.

However, the overhead of Fwink (having to send the picture over the network, or saving it to disk first) doesn't make for very easy "streaming" - at the very least the Perl script would need to watch the jpg file on disk for change and have to open/close it over and over to update the Tk image. If Fwink had an option to send the jpegs through standard output it'd be a different story. :)