WOW Insider has written a retrospective about how older patches worked when WOW was the new game.
http://www.wow.com/2009/07/07/the-patches-of-yesteryear-patch-0-6/
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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.