The debut episode of American McGee's Grimm entitled "A Boy Learns What Fear Is" is available for download.
As with each of the other 23 game episodes, it will be free for the first 24 hours, otherwise you'll need to have a subscription to GameTap or $3.99 (per episode).
Grimm has been split up into 3 volumes, each containing 8 episodes. If you decide to give the game a go and like what you find, there will be a new episode waiting for you every Thursday. Not a bad deal, huh?
You can download episode one by clicking here.