Looks like there was a ton of stuff hitting Xbox Live Marketplace today, so it seemed easier to list it all in one post. Most of this info is courtesy of
Major Nelson:
XBLA
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3 on 3 NHL Arcade (800 MS Points)
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Minesweeper Flags (400 MS Points)
Demo
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Tom Clancy's H.A.W.X. (Free)
Themes, Pics and Avatar crap
-Formal Avatar clothing for Valentines Day (no price)
-Sports Illustrated Swimsuit Calendar Themes (Free)
Brooklyn Decker
Nissan 370Z
-Sports Illustrated Swimsuit Calendar Gamer Pics (Free)
Nissan 370Z
Irina Shak
Daniella Sarahyba
Jessica Gomes
Brooklyn Decker
Bar Rafaeli (Cover Girl!)
Update (Chuck) - Added
Minesweeper Flags screenshots