Percival has updated his version of GTA Pong to support 2 players on the same PSP! I could be wrong, but I believe that makes this the first multiplayer homebrew game for those of you with 2.01, 2.50, or 2.60 firmware! Here are the other changes in this groundbreaking program:

-2 player support
-Added exit menu
-Faster ball movement
-The ball now actually looks like a ball, not a square
-The ball didn't actualy hit the player's paddle, now it does
-1 second delay after scoring

Instructions:
To install, Place the proper savegame folder (ULUS10041S5 for US, ULES00151S5 for UK, or ULES00182S5 for DE) on your Memory Stick. Boot up GTA and load this savegame file.

To play multiplayer with a friend, hold the PSP vertically so that one person has control of one side of PSP, and your friend the other.