Would love to see PPC/USD on BTC-e. It's the third largest coin and I see there is markets for much smaller coins like NVC on BTC-e at the moment. It's getting great coverage of late in WSJ, CNBC and the like and the last week has seen it really shoot up compared to even Bitcoin. I think you can infer from the volume of BTC/PPC transactions[1] that there would be an appetite for this market as well.