On the iPad:
- Space Station: Frontier HD [$4.99]
- Words With Friends HD [$2.99]
- Small World [$6.99] (read my review here)
On the iPhone:
- Doodle Jump [$0.99]
On the PS3:
- Call of Duty: Modern Warfare 2
[price varies]
On the PC:
- Alien Swarm [free via Steam]