I haven't seen anything posted on this yet, but I'm going to have to say that Archaeology is a pretty decent way to get yourself some decent XP if you have plans on leveling it.
I haven't really had the notion to level my "main" character... not sure why, just.. haven't.
Either way, I planned on getting archaeology on her, and after going at it for about 2 hours, she has about 55% of a level... on just archaeology alone.
At Level 80, I was getting 11550 XP per dig (there are 3 of those per digsite!) and my mom's Lv81 character was getting ~13800 or some such, with rested.
The XP piles up pretty quickly doing that.
Edit: The only bad thing, is that for some odd reason, it does not give you guild reputation, nor exp towards your guild level. I'm wondering if this is a bug, as all other sources of XP seem to work in that fashion, except Archaeology.
Edited, Dec 12th 2010 4:27pm by Lyrailis