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Let's get a cumulative list of all the healing blogs, guides, and theorycrafting websites we can't stop reading! Comment with any additional guides you know of, and I'll keep this list updated.
http://www.restokin.com/ Currently lacking a little for Highmaul information, but a great place nonetheless.
http://howtopriest.com/ This is an absolute must for anybody looking to priest, shadow included!
http://stoove.wordpress.com/ The inner ramblings of Stoove, a moderator in the shaman forums at Icy-Veins.