I was reading the answers here and there wasn't any game that i didn't know already about. Maybe you could do a top 10 new cool games.
Keep an eye out for Traveller-AR, Public beta coming out soon and it looks promising!
Angry birds get's my vote too though, so simplistic yet so addictive. I also found bridge basher strangely fun!
For the most part though I prefer games like Sudoku and Minesweeper lol! I generally only have time for quick games, and like to stretch my mind a little between working hours.