My paladin is going to be my new main, so I've been running through talent calculators a lot looking for what would work best. I don't have real numbers yet, and they might even change before 80 comes along, but these are what I have so far.
Holy:
http://wotlk.wowhead.com/?talent=sxAzxGzhVuMxRtZqbbx0h
Prot:
http://wotlk.wowhead.com/?talent=sVZ0eVAcuMteIRGoxb
Ret:
http://wotlk.wowhead.com/?talent=sZaxZVfbtbIucrsguAo
The holy tree is the one I'm least sure about. Is Bacon useful? Could a 16 minute LoH work, now that it's free? And it's missing every PvP talent in the tree so it's extremely specialized, perhaps too much.