nvm just found soloing thread. mods please close.
You should be able to solo all vanilla/BC raids at 85, without too much difficulty. As for Wrath raids, I don't really know, I'd imagine they're doable at 90 though. Haven't really had any reason to try them, I do know you can 2man ICC all the way to Lich King though, needed 3 people for Lich King though I think it would have been doable with 2 people if you had a healer/DPS.