So I'm relatively new to the world of cryptocurrency, but I've really become interested in the work that the Ethereum team is doing. I have also been exploring some other currencies to get a feel of what the field is like, and I've come across Primecoin and Ripple. Both of these systems use PoW methods (not really PoW in Ripple's case) that produce useful results other than simply producing coins. I was wondering if Ethereum was considering adopting a Pow algorithm that produces useful mathematical work? I know that some claim Primecoin is resistant to mining by ASICs, so I was wondering if this was something being considered.