Regarding skilling up boosted characters or other characters for multiboxers, In the blasted lands near the portal. You'll notice servants up on the ledge around the crater. (There are 5 or 6 around the upper edge of the crater near portal)

All of the servants are near pylon looking objects.

These guys are for a quest, they cannot be killed unless you have quest and can click on pylon, they will stay alive forever at 1% unless you run away in which case they'll reset.
They don't hit that hard, they are level 57, you can skill defense and weapon skills on them all day. They attack fast.
It's a one stop wonder for pre outlands =)

I just went over there pre outlands and skilled up all 5 of my guys weapons at the same time lol