Lots of good links here, I see lots of good tanking references you should definitely check out. I just recently started gearing my Paladin for tanking. I did a 3 day bender of nonstop solo heroics and many, many badges later, here is the result: http://www.wowarmory.com/character-s...Legion+of+Boom

That's the result of a lot of badges, a lot of cash, and 0 raid instances. My GS is sitting at 4545 and I'm comfortable that I'm ready to tank just about any raid I need to (except ICC, wtb wep / shield from HoR kkthks)