It's hard to be objective because I can't really remember what was on previous Humble Indie Bundles and what wasn't, but this new one feels pretty special. It might be the best one yet.
The games in the bundle are...
-- Little Inferno -- Awesomenauts -- Capsized -- Thomas Was Alone -- Dear Esther -- Hotline Miami (need to pay more than the average to unlock) -- Proteus (need to pay more than the average to unlock)
If you don't have any of the games in this bundle I seriously can't urge you to buy the pack enough. Of the games in the bundle I've played Thomas Was Alone, Dear Esther, Hotline Miami and Proteus. I loved all four of them. I'd advice you to get on this ASAP!