Humble Indie Bundle 9 debuted yesterday, and if you happen not to own a few of the games included, this is definitely a must buy. HIB 9 features Trine 2: The Complete Story, Mark of the Ninja, Eets: Munchies, Brütal Legend, FTL: Faster Than Light, and FEZ!
As per the norm, the bundle is separated into two tiers. There is a PWYW tier, which lands you all but FTL and FEZ, for any price you want! You will have to pay at least $1 if you want the steam keys, however.
The second tier is BTA, so at the time of this writing, beating the average of $4.54 would net you the whole collection.
It should be noted that it appears that you will need to BTA in order to get the as of yet added bonus games. Typically Humble gave you the bonuses as long as you paid $1 prior to them being added.
You also get the soundtracks for any of the games you unlock.