https://np.reddit.com/r/Bitcoin/comments/3o0vv2/kristov_atlas_coinparty_is_a_new_p2p_mixing/
This is a big deal. I've been salivating over the CoinShuffle concept for a long time, now, and this makes heavy improvements to that idea and also lays out a concrete design for its implementation.
Although there doesn't seem to be any code released, yet (damn), once there is (and after a little testing), this will (theoretically) be leaps and bounds better than any tumbler/mixer - cheaper, safer, more anonymous, and maybe even easier.
Working code could still be a while out, but this is definitely a high-priority goal for a lot of smart people (not enough of them seem to be writing code, though, unfortunately), and if you have any skills to contribute to an implementation of CoinParty (anything from encouraging words and publicity, to translations, to web hosting, to organizing a mailing list, to funding a bounty, to - of course - coding, etc.), I wholeheartedly encourage you to get involved.
This is big. Let's make it happen.
Until there's some code written for CoinParty, we do have JoinMarket which already has working code.
Edit: Orderbook watcher to get an idea of fees: http://ruc47yiosooolrzw [dot] o n i o n/