Stats are slowly in the process of going up. There is a stat dump file which records shares, difficulty, and server.
I originally wanted the stats to be integrated into the server but I might just write a program which allows you to enter you rewards from each server and calculates its efficiency.
EDIT: I did some quick calculations on btcguild and I have 9362 shares. I expected to get 0.299 btc for those shares. I got 0.384 for those shares. So I got about 28% more that I should have. Which is actually pretty amazing.
Damn. Just when I was about to bring my workers/miners back to BTC Guild I see this. I will wait until something is done to prevent pool hopping on BTC Guild. Basically they are stealing from other miners by doing this, IMO.
Delayed stats needs to be implemented.
projects like bithopper are very valuable because they bring bad stuff that others have been doing for a long time to the surface.
those that hop earn more, the others earn less - yep, stealing is an adequate term. Still I consider it the pool operators' duty to prevent it.