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"If you've been looking for an excuse to jump back into Halo 3 after your dalliances with Call of Duty 4, this may just be it: This weekend, you'll be getting double XP points if you win a game of Grifball, a game variation created by Burnie Burns of RvB fame. The game will be a social playlist from now until March 10 at noon. Also, Grifball is being treated like a tournament hopper with prizes available. At noon on March 20 the next double XP playlist will be activated: Team SWAT, which takes away radar and shields and adds health. So, is this enough to get you back to playing Halo 3? Or did you never slack off to begin with?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/03/07/get-double-xp-from-some-halo-3-playlists/>