WOW Insider's "WOW Rookie" column talks about how 5 man instances work. Next week they promise to talk about the 10+ man instances.
http://www.wow.com/2009/07/15/wow-rookie-the-inner-workings-of-instances/#continued
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The Solo MMO Player collects links to the most useful or interesting MMO websites, databases and blog entries I have found, with a bias toward topics of interest to the Solo Player. Use the search box in the upper left hand corner to find topics. Kelari NPC Warrior art courtesy of Game Fluid.