Just so people don't miss out, Steam has the following this weekend:

Flock 50% off (with new Steam achievements)
Bone-Breaking Racing Pack 85% off
Any MumboJumbo games 50% off (along with two titles at $.99)

And for the next week:
Freedom Force games 10% off
Assassin's Creed, Splinter Cell and Double Agent 50% off

I'm pretty surprised, usually there's just one game or pack a weekend, but there's a lot of stuff here. Personally, I'm gonna look at some MumboJumbo games and will probably get Freedom Force. Maybe check out Flock, too.

Thanks for the heads up. I have the first Freedom Force game and enjoyed it.

I'm getting both FF games and Assassisn's Creed for less than $17! Sweet.