A few days ago, Matt Green et al finally released their paper on Zerocoin/Zerocash, a much needed modification that actually makes Bitcoin anonymous.
Links below for the technical details, which are numerous — the idea is by no means ready for prime time, in any case. However, the general idea takes the “panopticon ticking time bomb” that is Bitcoin and adds real anonymity. Initial plans are to create a new altcoin from it… where do I sign up to buy some?
It will be interesting to see how much official pressure they get on this, of course.