Best cpu coin right now is monero... but it won't last long as someone is developing extremely fast GPU miner for it..
XMR was good for CPU until the GPU miner came out. And then the price crashed and no longer worth the hassle mining
I've noticed this as well. And it doesn't seem to be on too many exchanges yet. I heard that cryptsy couldn't add it because it the wallet address length was too long?!?!
I think only Primecoins for CPU mining.
I've been considering mining Primecoins for months - but it seems like the price continue to drop. Has there been any new development to the coin? Or is it also (eventually) doomed to the GPUs?