Ready or not, we're getting an extended maintenance tomorrow, Tarinae has the links and some information about the background downloader.
Priest - Discipline
I just discovered Type H for Heals and oh it is amazing! Check out Malevica's Discipline 4.0.1 Guide here.
Bob Turkey discusses talents here.
Avalonna has a guide for 4.0 here, and today Derevka from Tales of a Priest posted a Survival Guide for both Specs here.
Priest - Holy
Jinxed Thoughts on the Holy tree
Derevka from Tales of a Priest
Keeva's Quick and Dirty Guide to living in 4.0
Rank 4 Healing Touch - ICC25 HMs in 4.0.1
Vixsin just posted her Resto Shaman Guide here!
Resto Shaman Flow speculates on 4.0
Blessing of Kings - Holy Paladin Spec
Best In Slot's consideration of holy stats in 4.0
Kurn's What You Need to Know in 4.0.1
The Light and How to Swing it - Cataclysm Heroics in 4.0
Other Stuff (the sky is falling!)
New Blizzard Party Frames - Type H For Heals
Healing in Cataclysm Part 1 - Bandage Spec
Healing in Cataclysm Part 2 - Bandage Spec
Gem Conversion - Revive and Rejuvenate
Currency in 4.0 - WoW Blue Post
Clique for 4.0.1
Healbot for 4.0.1
'Twas the Night Before Glyph-Mas
It's possible that most of our addons will be broken, but it looks like most of our popular addons have beta versions in the works to be ready for 4.0.1. Those project authors have been hard at work before it goes live. Also, if there are great links I've missed, please let me know so I can add them.
I wasn't an avid blog reader when Wrath came out. I was still new, and my biggest source of information online was the official WoW forums (I know...). Anyways, it's been amazing to me that each PTR build has been dissected and posted. We've seen videos, guides, speculations, anything you can dream of for a game that isn't even released for another two months!