Looks like at some point between me leaving for work and now I dropped from 8ghash/s to a little of 5ghash/s. I'm guessing I have a port going bad on my hub or that same antminer U1 stopped working again. If I was running as much as I have seen some run with the 49 port USB hubs or the 4 or 5 S1's I don't know if I could take it being stuck at work and not be able to see what's wrong. Maybe its best I don't get anymore.
Amongst other things out of whack the site appears to be reporting accepted shares low. Bfgminer is showing almost double what Slush is reporting on my rig. Likely your hardware is working up to par.
The share counts have just been reset on my Account page, which usually corresponds to a new block, however no block was found by Slush. The 'unconfirmed reward' is showing now (maybe fixing this is related to the shares reset). Note that the hash rates reported on Slush are "* The calculation is based on the number of shares so far, which may not be accurate for slow workers", so with the recent chopping and changing in the pool reporting, the hash rates reported are quite unrelated to your actual hash rates on your mining software.
Cheers