I'm on a pool with 750-930GH/s (it varies alot) and on bitminter 230TH
for the past 36 hours, both pools are ***really*** down on block finding. In fact the whole network apart from btcguild seems down on its luck !
BTC Guild's luck is negative if you use a 36 hour window. It's only started to pick up in the last 8 hours or so.