C3PX:
System Shock 2 is now on Steam for Windows and Mac, I plan on getting it and beating it sometime, but I haven't felt like spending the money lately. Maybe it will go cheap in the next big Steam sale (it's only $10 now, I think).

For those who like cheap games and Steam... and went camping during the Steam Summer Sale, or something equally ridiculous...

Anyways- you can get pretty good deals from this thread on CAG:

http://www.cheapassgamer.com/topic/307615-steam-group-buy-and-gift-requests-thread-v2-read-rules-before-posting/page-226

There's a ratings system, so you can see if they're good traders. I've made maybe 10 purchases from these guys and have yet to get burned.

A lot of the going rates at maybe Steam Summer Sale price +10%. Sometimes it's even less than that.

Also, on the deals front: if you're a PC gamer and haven't checked out the EA Humble Bundle, on sale now, then you're dumb.