The Humble Bundle is a group of independently produced games offered for a donation of what you want to pay.  They have incentives to get you to pay more than the current average.  Whatever you pay goes to charity.  You designate how much goes to charity and how much goes to the developers.

Torchlight is one of games included regardless of the amount paid and I highly recommend getting it if you don't already have it.  I do already have it and decided to play it again, am considering getting another copy and gifting it out.

If you pay more than $1, you will get a Steam key that will unlock all the games.  If you don't care for Steam, they are all DRM-free downloadable.

http://www.humblebundle.com/

That's a cool idea.  It looks like it is working out pretty well for them, too.