Prince of Persia
It's fairly short, and it's missing the console versions' bonus features, but Prince of Persia is a truly excellent action adventure game for as long as it lasts.
Beyond Good & Evil
While the game feels pretty short, its interesting premise and impressive presentation pick up the slack and make Beyond Good & Evil a game well worth playing.
Blade of Darkness
It's got some problems and takes some time to get into, but should otherwise appeal to players who've enjoyed previous hack-and-slash action games, or like the idea of them.