Dilbrt has written a comprehensive guide to raiding gear for holy paladins, setting various choices for all the gear slots and giving excellent advice for gems, enchants and professions. All of this combines fits the niche healadins find themselves in when thinking about progressing to end-game raids.
As it's a niche subject and as the FAQ is mainly aimed at prot-spec paladins, I think it would be worthy of its own sticky.