If you're looking for a collection of classic timewaster games for your iPhone or iPod touch, look no further than Freeverse's Big Bang Board Games, which includes Chess, Backgammon, Checkers, Mancala, Reversi, 4-In-A-Row, and Tic-Tac-Toe.
The artwork and gameplay is taken directly from the Mac version of the game, and Chess has a portrait (3D) and landscape (2D) mode.
Unfortunately, each game only has a one-player mode. It would be nice to have a two-player option, for those situations where you're waiting with your significant other for a table, or in line for a movie.
Other than that, they're great games for my (sigh) favorite activity: sitting quietly through endless telephone meetings. Note to self: my clients don't read TUAW, do they? Just kidding, everyone!
Big Bang Board Games is available in the App Store for $7.99.