My pool is 1000 blocks ahead on a different chain. Someone's pulling shenanigans.
I was able to restart the daemon after a few attempts and it processed the funky blocks, back at a normal block height now. I assume the attack isn't over however.
SetBestChain: new best=5af8c2c1f4d54cf07b25 height=91906 trust=49587556456 date=08/24/13 07:19:30
There's no attack afaik, reason for these blockchain forks is that PoS is broken. It generates blocks that arent accepted by whole network, thus generating private or semi-private blockchains.