We don't normally post about beta tests for upcoming apps, but Swipe Interactive's QuickDraw game seems unique enough that we felt it would be of interest.
The developer describes the upcoming game as real-time online multiplayer drawing game with up to 10 players competing. Each user takes a turn to draw a picture which describes the given word. The drawing is transmitted to the other users' screens and the one that guesses quickest wins the point. The player with the most points at the end of the round wins. The game is said to work over Wi-Fi, 3G and Edge.
The developers are asking for testers for a limited beta. Sign up at their site but space is limited.
Overall, there aren't enough online multiplayer iPhone games and this one sounds particularly promising.