Shaman healing changed dramatically in WotLK. A good place to go is... EJ.
Shaman: Restoration - Elitist Jerks
While still being a work in progress, it's probably the most comprehensive look at Resto out there currently.
An interesting read on LHW:
[Resto] LHW Spamming for Fun and Profit - Elitist Jerks
edit: the LHW article is probably a better read if he isn't interested in every single aspect of it just yet