I'm not sure if you would consider this a "theme program", but I use Aston shell:. astonshell.com
I use somewhere in the realm of 70+ themes, though I primarily use "Liquid Light" (thanks [size=-1]Crazy World Alex!! ) It takes some getting used to but I can't ever go back to plain old windows anymore! not even windowblinds by itself is good enough, but even more cool is that I can use W.B., Aston, and Cursor XP as well! Also If you don't already use it I strongly suggest you check out out Mozilla
Jelliot
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I use somewhere in the realm of 70+ themes, though I primarily use "Liquid Light" (thanks [size=-1]Crazy World Alex!! ) It takes some getting used to but I can't ever go back to plain old windows anymore! not even windowblinds by itself is good enough, but even more cool is that I can use W.B., Aston, and Cursor XP as well! Also If you don't already use it I strongly suggest you check out out Mozilla
Jelliot
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