Oh, looks like those 4 I mentioned were just incorrectly traced by blockchain.info.  Looks like 2 were from GHash.io, one from HHTTMP, and one from a private pool.  Weird.
Sorry Tycho!  I'll keep mining a little on deepbit and hopefully get my balance a little higher (looks like it's getting a block every 4 days on average and deepbit is about due for one).