Many crypto-currency users have investments in many different coins. They often use exchanges like Cryptsy to facilitate trading between these different currencies. Presently, however, if they want to transfer these coins to/from offline wallets, many steps are required. You can imagine the pain in running 6 different wallet programs on your computer, initiating N transfers, etc.
My proposal is a desktop (or possibly online) wallet that supports multi crypto-currencies at the same time. Supporting multiple coins will be part of every operation, including generation of a single offline paper wallet for multiple coins. It will also be exchange API friendly, allowing the user to see balances and initiate transfers to/from exchanges for multiple coins with only a single action.