Cataclysm Mastery System

A summery.  It's old but is one of the clearest explanations I've found.
http://www.brighthub.com/video-games/mmo/articles/47462.aspx?p=4

WOW Head has the next best explanation here.
http://www.wowhead.com/guide=cataclysm&mastery

Here is WOW Insider's summary of Cataclysm as a whole.
http://wow.joystiq.com/cataclysm

The mastery system link is here.
http://wow.joystiq.com/2009/08/22/blizzcon-2009-mastery-system-and-talent-trees/

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Copyright Solo MMO Player at http://solommo.blogspot.com

Cataclysm Mastery System Details UPDATED

Blizzard has announced details about the new mastery system that will change the stats of your characters forever when Cataclysm hits.  WOW Head explains it all in a few words:  "In a nut shell the mastery system will basically give you bonuses that increase damage, healing or survivability according to the amount of points spent in the tree. Along with it you will get a secondary bonus to a stat that is most desirable to you, like haste or crit. There is even a third bonus which will be completely unique to the tree and will benefit from the mastery rating on high-level gear."
http://www.wowhead.com/?blog=147803

UPDATE:  WOW Insider published some clarifications Blizzard made this evening.
http://www.wow.com/2010/03/09/updates-and-clarifications-on-the-mastery-system/

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Copyright Solo MMO Player at http://solommo.blogspot.com