Humble Bundle is particularly epic this month. Square Enix this time and a great list of games.
Any price tier is Thief Gold, Daikatana, Mini Ninjas, Anachronox, Hitman: Codename 47, Hitman 2.
$7.33+ Nets Deus Ex Invisible War, Deus Ex The fall, Hitmal Absolution, Nosgoth Vet Pack, Battlestations Midway, and some as yet undisclosed other titles.
$14.99 includes Deus Ex HR Director's Cut, Just Cause 2, Laura Croft GOL, Deus Ex, and Kane and Lynch 2.
The only turkey of the bunch is Kane and Lynch, everything else is at least playable with several titles being most excellent games. I've not played Deus Ex the Fall yet, so I can't comment there.
Still, the three Deus Ex games alone are worth $15. Just Cause 2 and the Hitman games are fun as well, plus a couple of decent first person RPGs with Anachronox and Daikatana. If you don't have these games, or if you're even just missing a few of them, this month is a great bundle.