Cloakcoin PoSA is the gold standard for anon coins.
http://www.deepdotweb.com/2014/07/17/cloakcoin-promises-holy-grail-cryptocurrency-anonymity/

Completely decentralized. No huge overhead for "master nodes" like Darkcoin.
And soon "One Market" decentralized marketplace where you will spend cloakcoins.

heres an excerpt from todays IRC

The result is what we've described so far:
It looks like transactions using PoSA generate new anonymous addresses for each send and recieve for starters. They aren't normal addresses.
i sees
So your wallet address, when you look it up ont he blockchain - if all you've been doing is PoSA transactions you don't even see your address the network says it has never seen it before
So that's the start
Then it seems to blow the transactions up into dust amounts
nice
thanks for the hard work devs and beta testers
making history =)
And it passes that dust through various stakers wallets
Those stakers act as anonymizes, they don't have the real address for where any of that dust came from or an idea of how much was actually sent
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That dust could be miners fees or whatever for allt hey know
So it goes around the stakers, being anonymized. Since there are so many stakers it's like every single person is a masternode, which solves a lot fo problems that dark coin has such as coentralized control of nodes
Then all the transactions are slowly passed through the same stakers until they are deposited to again a newly generated anonymous address not associated to anything else on the wallet
Thus niether side of the transaction is able to figure out shit.
And there are extra fees that all stakeing wallets pick up
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so in effect we are all masternodes And collect those extra fees (masternode payments DRK)) By just stakeing
^^
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So if this coin goes to $10 You could make a extra 15 coins a day if you heavy stake some good blocks
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It's pretty ground breaking stuff.