Summary on Mastercoin wallets
Grazcoin - hybrid web based wallet.
Zathras - masterchest wallet
Omni wallet - saw it in the dev emails.
Me - mymastercoins wallet.
Android wallet to follow soon as windows wallet is stable.
Tachikoma is working on the go implementation of mastercoid. Which will be the basis of all future wallets.
Thanks for the update. I believe that the MSC team are working hard to materialize wallets and other applications. A thoroughly-tested and safe wallet would be the key for the long-term success of MSC project.