We are planning to build an anonymous DW library with built in mixnet support. Not sure if Harry mentioned this to you, but this is a long project in the planning since 1+ year because we are advancing new crypto anonymity techniques (the ring sigs code in libbitcoin originally was part of that but we've moved on significantly since then). So this will be a strong application to have too, and we think it will help revive crypto from the current winter and give it back its radical focus on free market, anti-state, anonymous values.