I've been playing a load of:
- WordFeud - multiplayer Scrabble with a fast and clean interface.
- Towers & Trolls - tower defense game with lovely graphics and sound, tough levels and a distinctive arcade feel. Ad free, free to play, with paid for cheats.
I've got Zookeeper, Chu Chu Rocket and Sonic CD as other paid for ones but they don't see nearly as much play...