Recently, Blizzard (8/15/2011) published a draft documentation for its RESTful APIs in the following location:
http://blizzard.github.com/api-wow-docs/
APIs cover information about characters, items, auctions, guilds, PVP, etc.
API requests are currently limited to 3,000 per day for anonymous use, but there is a process to register applications that have a legitimate need for more access.
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