I will continue to help Deuswolf get more tanking gear. He's in pretty good shape right now.
My quick summary of the level 70s
(my apologies if I forgot anyone; I can't check the guild roster from work)
Tanks
Arvernien, Deuswolf, Corneilous
Melee DPS
Flavish, Nightloom, Zyamdone, Loraeille
Ranged DPS
Lassyran, Detrimental, Tuber, Dloc, Killakozmo, Moonghost,
Healers
Everit, Vescas, Dpre, Pepsitron
Everyone needs to take a good look at their gear and decide if they are really ready for Karazhan. I think Tuber, Moonghost, Corneilous and Deuswolf need a few improvements. There is a good forum on www.wowhead.com with suggestions for warrior tank gear for heroics, 10 player and 25 player raids. I imagine there is a similar forum in each class section. Some of the numbers in Vescas' post are starting points. For example: casters want to have 16% spell hit to really shine, 3% is a minimum. The forum pages will give you some good suggestions.