So my little mining setup has been running for almost a week now and I just found out I’m mining Namecoins in addition to Bitcoins.  It appears that BTC Guild, the mining pool that I’m in, has Merged Mining.  Since Namecoin is built on the same protocol as Bitcoin, mining hashes would be applicable to the Namecoin blocks.  So when my miner generates a hash it gets applied to both a BTC block and an NMC block at the same time.  Cool!