So whats this coin all about?
Visit OP and the subsequent links....Basically its a community which is keen on anonymity. The developers of the Coin are implementing a "technology" called Zerocoin, which would be the ultimate anonymizer as of now. Compared to CoinJoin or Ring Signitures Zerocoin is far more sophisticated. Not to forget i2p which is already compatible with the wallet
https://wiki.anoncoin.net/Anoncoin_Wiki
Whats the difference between zerocash and zerocoin? As far as im aware SDC is in the process of implementing zerocash into their anon system.
Zerocash is not yet fully developed - Miers and Green are not done with the code as far as I know, they wanted to release the Coin this time around, but who knows, nobody knows anything about it, so any Coin who says they implement Zerocash is basically ... lying.
Zerocoin will be implemented by the Anoncoin Devs, (with RSA UFOs, the original idea was without them), we dont know of any particular Coin with a real approach to implement it, at least nobody is doing the coding correctly (mostly they add the "ZC" branch to their source and that's it) Here in Anoncoin the Devs are really working on it (see source)
The technical differences between Zerocoin and Zerocash are in the wiki ... please read about it here
https://wiki.anoncoin.net/Anoncoin_Wiki