This has gone the rounds in a few places recently. Basically, a Japanese chap by the name of Y. Kamada managed to create a clone of the Gundam-themed Capcom arcade games (of which many have received PlayStation 2 ports already and another arcade iteration is around the corner), except the fact that this is entirely free. Bar the obvious fact that the mecha contained within the game are not Gundam mobile suits, despite a few striking similarities, it’s a pretty impressive effort on the part of one individual. In any case, Mirrormoon has created an English installer and hosted a few mirrors of the file accordingly. It’s also got online multiplayer, so go have some fun!