You do know that ZeroCoin is a protocol change to *coin?
It's not designed to be it's own crypto- currency unless the dev team has run out of patience with it being adopted and decided to fork.
From the github page:
Zerocoin: C++ lib for anonymous extension to bitcoin
That's what I thought, to me Anoncoin is a more realistic option that actually seems to be making progress, for the record, I've realised I've mentioned it a number of times now and no I don't own any

I would like to though.