Today at Penny Arcade, Tycho promoted a role-playing game called Eschalon, Book I. I downloaded the demo and spent about 20 minutes with it. The game's graphics are ten years out of date (and not remotely appealing), and the story and setting are equally cliched. The final straw was that when I clicked on an item, my character didn't automatically walk toward it. Move along.
If you're looking for a free game to play, then try one of these.