I'm currently playing Professor Layton and the Curious Village (DS)
, and Peggle (XBL)
Professor Layton is like the perfect game for me, because I absolutely love puzzles, mind benders and riddles, and the ones in this game are truly brilliant. They are just the right level of difficulty to get the little grey cells going, and give you a great sense of satisfaction when you figure them out. The game is presented beautifully in it's setting and text, and Layton himself is as charming as Sherlock Holmes. One of the best games to come out on the DS in a very long time.
Peggle is simply one of the most addictive games there is. I got it yesterday, sat down and hardly moved from the sofa until I'd completed the Adventure section. Play the XBL demo, and you'll see exactly what I mean, or check it out on Steam.