Switching gear is easy though, at least compared to the painstakingly expensive task of resetting and rearranging your talents. Come Wrath of the Lich King, however, Blizzard might be implementing something that could make this process a whole lot easier. Here was Bornakk's statement regarding this possibility:

We talked about this recently at the Worldwide Invitational actually. We are looking into allowing players to basically have two talent specs that they can switch between but we are still working out the exact details so we will have to wait and see exactly how it will function in-game.

Bornakk's post leaves a lot of questions regarding the mechanics of talent-swapping. One possibility being discussed at the WoW forums is that players will be able to switch their talent builds on the field while not in combat. The switch will carry a long cooldown time to discourage possible exploits with this ability.

The other possibility that was brought up, and one I'm leaning towards, is that talent switching may be set up like a pet stable. Players will spend gold at a corresponding NPC to allow them to record one talent build. Switching talents itself will also cost a bit of money, though probably not as pricey as resetting. Those interested in joining the ongoing discussion regarding this matter may want to visit the WoW forums, via the source link below.