When Deepbit gets >51%, the exact same thing can happen to bitcoin. People who get blocks solo will get killed eventually by the pool. Solution: STOP USING POOLS.
I think many times that pooled mining should be forbidden and each IP should also have it's hash power limited to something like 5 Mhash/s or some other reasonable number, to stop this attacks from happening and to give everybody a fair chance on mining.
I know Satoshi didn't like when people started GPU mining, so he would like even less the power of the pools.
It's a terrible waste of electricity to say the least.
(sigh) Okay, that is not what I meant. I said that sarcastically, since I use a pool myself, but to remind people you can't have both an apple and an orange (that's not how the saying goes, but whatever).