Class Discussion
Priest Resources
Apart from the usual icy veins beginners stuff, http://www.icy-veins.com/wow/discipline-priest-pve-healing-guide and http://www.healingwow.com/priest/
There is also some good information at http://howtopriest.com/viewtopic.php?f=20&t=6229.
www.tootsmum.com also has some great stuff, but you don't need to be a priest for that :P (super tempted to buy this domain name btw)