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.
HP: Chamber of Secrets
Harry Potter is back for further adventures at Hogwarts in a game that combines levels that loosely recreate parts of the second book and others that focus on conventional action-adventure mechanics.