Is there something I'm missing with these mods? I download them, extract them and then most of them say the msvcr100d.ddl file cannot be found, even though the file is in the same folder! This is starting to annoy me, is it my own incompetence, my computer or the PT mod's fault?

You can always join us on IRC.

irc.freenode.net #powder

GPL.

http://lmgtfy.com/?q=GPL&l=1 Google is your best friend when you don't know something computer related :p (basically it's the license TPT is under that says you must release the source if you distribute any build)

I played around with the source code a bit and made my own version. (i did not use his source code) http://github.com/fishkid/The-Powder-Toy. GLOW is under liquids, though i might move it to a different category.