Yo noticed that too eh? I've been just mining in P2pool for a few days now(24 hours continuous), in the last few days no one has gotten a single share, the p2pool.info is saying 4 days now without a found block; I think I may have only of gotten some Bitcoins from a few donations since I started 2 weeks ago.

P2pool is working on a very different system then the larger pools, I think Slush's pool gives out a share for every work unit regardless if the pool finds a block or not. In the end on a bad week Slush is taking the brunt of the losses, hence the 2% infrastructure tax to make sure he keeps in business.

P2pool is acting more like one big solo miner, and with an average of only 300gh/s it takes a whole day for the whole system to crack a block. meanwhile slush's pool has 6000gh/s! The averages on wins and losses smooth out a lot better on slush's pool or on the gargantuant BTC pool, that one is huge!

It also doesn't help that the pieces sent to miners is quite large, it takes my rig 760mh/s 1 hour to hash them, it is very distrubing to me when I see the estimate amount at .065 and after a dead or orphaned block It pounds right down to .043, very painful, I haven't gotten a cent in 4 days. but thatws how p2pool works one giant congregation of solo miners, working together but facing the same benefits and challenges of solo mining with the rewards being distributed.