Edit: Oh bummer, looks like what i did isn't working anymore.
To spice up the discussion of btcguild's anti pool hopping measures i hacked together a little guesstimate thingy for the round start times.http://btcfun.appspot.com/
My feelings to pool hopping are ambivalent, so i'm not sure what i'm going to do with it.
It's probably not a good idea to incorporate it into your hopping tool because it's likely that i change the displayed data or remove it all together on a whim.
Also it looks like btcguild's UTC clock is off by one hour.