a thing I've been wishing I had is some sort of price-vs-difficulty comparison metric - you might think, for example, that the dramatic rise in bitcoin costs would mean that mining had gotten more profitable - but unfortunately, the first wave of "Application Specific Integrated Circuits" are being deployed, and they're not even available for sale yet - so the mining capacity is suddenly and dramatically in the hands of a small group of organizations. But that hasn't been obvious at all from the various charts online.