Another good pay what you want pack of indie games is up for sale again.
Crayon Physics Deluxe
And Yet It Moves
The lowest you can pay for these is $.01 so there is really no reason to not get them (although proceeds go to charity so I encourage you to donate more if you can :P)
Also they are usually redeemable on Steam, meaning they will give you a code and you enter it in Steam and it will give you all the games on Steam.