Last night we got a new build on the Beta servers and the nerf I predicted to Archaeology experience was part of the changes. Prior to the change, here is the experience I was getting on my druid:
@ Level 82 - 73290 rested / 36645 normal
@ Level 83 - 92190 rested / 46373 normal
@ Level 84 - 121440 rested / 60720 normal
There are slight variances between expansion continents, for example I would get 57960 XP in Kalimdor vs. 60720 in Northrend. But overall I was getting about 60k XP per loot from Archaeology. This has been reduced by about half based on the numbers I'm seeing now. I don't have a complete list yet, I'm still verifying some of the numbers. But I can share what I've found so far:
@ Level 80 - 23204 rested (all continents appear to be normalized)
@ Level 82 - 36644 rested
@ Level 83 - 46094 rested / 23047 normal
The direct comparison is the level 82/83 numbers, but as you can see the experience received today at these levels is about half what it was before. I'm pretty comfortable sharing these numbers because I believe Blizzard has likely done their massive adjustment and any further tweaks will be minor. Kaliope was able to go up 4.5 levels with Archaeology and she still had 100 more skill points to go. That's really just too generous in terms of XP for leveling a secondary profession. These new numbers should be much more reasonable.
I'm still working on finishing Archaeology so I can compile a final report of the profession, but for now I think Archaeology is still a viable alternative to questing. It's just been nerfed to the point where it won't be easier than questing :)
As always, feel free to post any questions or research requests in the Comments!