Check out Apple's App Store that comes with the 10.6.6 upgrade-
I found a free gem in there for you old arcade game fans.
Pangea has a free game called (imagine this) Pangea Arcade.
It has delicious graphics and sound on remakes of arcade classics. They really did a great job. It says it's free for a limited time. Same people who made Bugdom, Nanosaur, OttoMatic, Cro-Mag Rally and others. Fun stuff!