Basically a pack of five independent games (World Of Goo, Aquaria, Gish, Lugaru HD and Penumbra Overture) which together would normally cost $80, but you only pay how much you want to, and the proceeds go towards the original developers and two charities: Child's Play and Electric Frontier Foundation.
There are no middle men to take a cut of the cash, and the games are DRM-free: once you buy them, they're yours to do whatever you want with.
Although I'd hurry up since there are only just under 7 days left of this *crag*ing boss of a deal, so HOP TO IT ASSHOLES
Also two days left. SHIFT YOUR SCROTES IF YOU WANT THIS
SUDDEN DISCOVERY
Those who donate also get Samarost 2 as a secret game.
TIME EXTEND
The deadline was extended by a few days due to four of the games pledging to go open source. Awesome.
Also, Penumbra Overture came with coupon that lets you get a 75% discount for Penumbra Collection.