Lucidity, South Park Gracing XBLA This Wednesday
Each game will cost you 800 Microsoft Points ($10). Footage of Lucidity--which is also coming to PC--can be found here, while a South Park trailer is exists on the official site. And if you can't decide, there are always the trial versions.
From The Chatty
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I've got the intro song from Full Throttle in my head. It's AWESOME!