The best farming locations for various items (Patch 4.3.3)
http://www.wow-professions.com/farming-guides
Here's a skinning guide, by level.
http://www.wow-professions.com/wowguides/wow-skinning-guide.html#1
Places to farm (this is organized by profession)
http://www.wowwiki.com/Places_to_farm
Leatherworking patterns/recipes (dated 2008)
http://www.tentonhammer.com/node/26688
Skinning and leather information
http://www.wowpedia.org/Skinning
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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.