Games that haven't changed in ten years

Street Fighter (SNES, Genesis, PSone, Saturn, PS2, Xbox, Xbox 360)
Actually, it's more like 15 years without change for Street Fighter. Ten years ago, the game was starting to try 3D (pretty unsuccessfully, really), which is likely where the series will continue, especially seeing as Street Fighter HD is a download-only game. Not that it affected the gameplay. Pick up any Street Fighter game later than 1992 and do the quarter circle and attack command. Or the "away for two seconds, forward and attack." You're bound to trigger a special.

Above: 2D Street Fighter II Turbo is going HD in a straight remake. Who knows what SF4 will bring