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"Due to popular demand, Treyarch is now opening up Call of Duty: World at War's Nazi zombie co-op playlist to everyone on PlayStation Network and Xbox Live, nullifying the previous requirement of completing the single-player campaign. For the uninitiated, Nazi zombie co-op has you and up to four others fighting off endless waves of -- you guessed it -- nazi zombies. And before you ask, no, we never tire of nazis or zombie massacres.Treyarch is also giving out double the experience points this weekend. It started this afternoon at 1:00 PM ET and will stay in effect until an undisclosed time -- probably Monday morning, if we had to guess. If you're in desperate need for some double XP, we suggest you take off work / school now and head to your console of choice.[Via X3F; thanks, mdouet!]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/01/16/cod-world-at-war-unlocks-nazi-zombies-for-all-gives-double-xp/>