Who the hell are you?

[Taras]

First, second and third blocks relayed from that IP.
Do we have a new mining pool?

[Taras]

The btc generation went to the same address as another pool. This is probably just an unrecognized BTC Guild server.

[Trongersoll]

I thought that the "relayed by" the first node to relay the block data, not the miner that created it. But I could be wrong. 

[eleuthria]

Those are megabigpower/100TH.  The message is in their coinbase.  They've been solo mining for a few weeks now, but it looks like they only recently got their coinbase message to work.