This, along with CoinJoin and Dark Wallet is what Bitcoin needs. I personally don't have enough coins to make depositing here for interest worthwhile, but I'll definitely be using this and I'm glad to see that people are building solutions that keeps Bitcoin fungible.

By the way if you have not seen it, you need to read what is going on in the private Bitcoin Foundation forums: https://bitcointalk.org/index.php?topic=334520.msg3590446#msg3590446