Yeah, the middlecoin.com boat has sailed, alas. Ask him how it's doing now with that pool.
The multicoin pools like Middlecoin are essentially arbitrageurs of the many crypto coins, and the more people that enter the market (and there are a lot coming in), the less opportunities there are for arbitrage. Now, you're best bet is probably to mine Dogecoin and hope that it reaches the potential that seems likely, since its coin supply will decline dramatically in less than a year.
The multicoin pools like Middlecoin are essentially arbitrageurs of the many crypto coins, and the more people that enter the market (and there are a lot coming in), the less opportunities there are for arbitrage. Now, you're best bet is probably to mine Dogecoin and hope that it reaches the potential that seems likely, since its coin supply will decline dramatically in less than a year.