I've been trying to add "Equipping a ____" pages to the wiki to store this sort of information. For instance:
http://wiki.project1999.com/Equipping_a_Druid
http://wiki.project1999.com/Equipping_a_Shaman
http://wiki.project1999.com/Equipping_a_Necromancer
http://wiki.project1999.com/Equipping_a_Ranger
I really don't know tank gear (Blue or Green) well enough to even start one for Warriors/Paladins/Shadow Knights, but if anyone else does and feels motivated ...
Plus of course if you don't want to do that you can always just add items to the existing "Class/Era/Raid-level" lists (ie. pages like
http://wiki.project1999.com/Players:Planar_Gear).