First, thanks for reviewing DCSS
An update to our stable version is going to be released very soon (0.8.1)
a) Crawl runs on all windows versions from w2k to 7. There was a bug which prevented it running under w2k, but it's been fixed in 0.8.1. We provide 32 bits binaries, so they can run on both 32 and 64 bits windows. No issue specific to 64 bits windows has ever been reported.
b) Since the game is turn based, we don't really have any strict hardware requirement. The tiles version should run fine on any PC with 256 MB RAM and a GPU with OpenGL drivers. The full install takes about 32MB of hard disk space. The console version needs even less and has been reported to run fine on a 700Mhz PIII with 128MB and VESA graphics. It's also possible to play the console version online with just an ssh client, or the tiles version with a very recent browser (websocket compatible).
The game is GPL, so you're free to put in on your download section, as long as you leave all the docs with it which provide license information and points to where and how to get the source.
The best way to contact all devs is through to crawl-ref-discuss mailing list. Its address is in the README.txt. But posting here is fine too
Let us know when the review is out, and don't hesitate to come here for advices if you need any.
<+Grunt> You dereference an invalid pointer! Ouch! That really hurt! The game dies...