Thanks go out to "Certified" for telling me about this today!
Right now in the "Social" section of the Xbox Apps Marketplace (on the dashboard only, no link is available) you can download "Voice Studio" for free.
It has 5 avatar awards and a 50 Gamerscore you can unlock. This is not a game however, it is a testing app for the Kinect voice feature. Remember "Fun Labs"?, kind of the same idea.
There was an issue in the past when this App first released on the Marketplace, it did not unlock the awards so they pulled it. This issue has been confirmed as fixed with the new release.
If you don't see the App right away try again, it took me 3 tries before it showed up.
Here are some pictures of the avatar items.
Here are the achievements:
Video of the App:
http://www.youtube.com/watch?v=vh2z5As12oM
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