The concept of zerocoin should be implemented in bitcoin. Zerocoin exists exactly to prove that its concept is sound.
In the beginning, Zerocoin started out as a computer code that would add more anonymity to transactions through Bitcoin. However, it is now being built as a different digital currency due to some Bitcoin users who tried to convince Congress that Bitcoin transactions are traceable. A paper was released in April 2013 by Green and his grad students which explained what Zerocoin was and how it would work. They had hoped the paper would garner attention from developers who wanted to build it. However, after no one contacted them, they began writing the code for Zerocoin themselves and it is expected to be ready by summer.
No wonder no one contacted them, the current "bitcoin foundation" is a joke, just look at the members, mt gox? LOL
Bitcoin developers should go and implement that in bitcoin