I sympathize with the concept, but making things harder just for the sake of it seems counterproductive. So many wasted cycles & electricity. Id like to see more coins that do useful work, like Primecoin, creating a social value while doing work. I don't care if it's just calculating a big fractal or something, but I'd like to see all these resources devoted to something real.
Seems counterproductive in your explained view. Don't get me wrong: I like the idea of actually producing anything 'useful' with the hashing power like your mentioned primecoin is doing (i'm mining XPM btw). But besides that it's still about getting coins out of mining and we don't want certain people to have an advantage against others in that game. Therefore a CPU friendly (and of course 'botnet/server farm' resistant) coin may is the right way to go. We would love to include calculations in the proof of work algorithm that brings what you have called 'a social value' but we don't want to loose the mentioned focus in it. If it somehow can be combined, just let me know..