I'm just waiting for CS:S to go 75% off. I've had Steam for 5 years, and clocked up over a hundred ours on that game, but never actually bought a copy for myself :\
If you change your name to "Will camstrip 4 ...." it only takes a few minutes. You can half that time if you have ukgamer on your friends list.
I gave a standard grade Train Sim 2k12 to shitstorm to make him shut up and enjoy. Then in an paroxysm of weak-mindedness I got myself the Deluxe edition of that "thing". Train Sim needs MP! EDIT: Have to thank Ysundur for "Dear Ester" :D
DayZ netted quite a lot of income for ARMA II, it's been in the top sellers for the whole sale and hasn't dropped from it's crappy sale price. W00kie upload some mad frag vids.
Topped up with Dear Esther, Duke Nukem Forever complete and GTA complete. I hate the amount I spend during steam sales. On the upside I wasnt tempted by the £30 Railworks collection