I've been watching YellowCoin, unfortunately it isn't profitable at all to mine... its roughly ~0.002 btc/mh/day currently.
Its block reward should jump from 1000 to 4000 today. I'm waiting for this jump to start mining it.
Block Rewards:
Day 1 (POW): Blocks 1-4320 - 1000 YC
Day 2-7 (POW): Blocks 4321-30240 - 4,000 YC