As Micah said above, one way is to run a lowbie with a high-level healer (priest or whatever) and just cast heals since they don't reduce XP. Be sure, though, to NOT party with your healer otherwise your XP will be reduced. With a priest this means you can't shield your lowbie since PWS can only be used on group members, but its not that big of a deal.

Of course if you don't have a high level healer, its time to start working on one ...........