I like Tetris and Brickbreaker... Brickbreaker is loaded on your BB... and recently Tetris was modified to work on the 8900 and was a storyline on CB's Blog... you can find it fairly easily by going back maybe a page or two.
I think Papped (the guy who created that Tetris game in the above link) was going to create Pacman, but I'm not 100% sure of that. There was a mention of it in the Tetris game thread.