If the Humble Bundle 9 wasn't already good enough value, it juiced up even more overnight, with the addition of indie titles Bastion, Limbo, Rocketbirds: Hardboiled Chicken, and A Virus Named TOM to sweeten the pot for anyone that pays over the average price (currently only $4.66). If you'd previously bought in above the average, then you just scored four free games.
Bastion and Limbo alone are both widely acclaimed indie hits, and alongside Trine 2: Complete Story, Mark of the Ninja, Eets Munchies, Brütal Legend, FTL: Faster Than Light, and FEZ this one is hugely recommended for anyone that doesn't already own the lot.
All games are provided as Steam keys, with most also available as a DRM-free download for PC, Mac and Linux. Check it