Same as Swae, I can't add any other apps to the list that aren't already there. But, for games, well...
Robo Defense - similar to lemmings, but instead you build mazes to destroy'em. Incredibly addictive and continues to be challenging as you climb the levels.
I've been dabbling with many more, but Robo Defense is probably the best one so far. Others so far include, Gem Miner, GalaxIR (modified risk), Guns 'n Glory (a mix of robo defense and red dawn redemption), Star Traders (RPG), and Island Settlers (Tile strategy with dice)