A Wallet for many blockchains (not just the bitcoin blockchain)
The Exodus Project might be of interest: http://www.exodus.io
It's a multi-currency desktop wallet with shapeshift (altcoin exchange) already built-in. You can already download a beta version of it, official launch is going to be this summer according to the projects homepage.

I can't find an example better than https://www.omniwallet.org right now, but I think there have been other multi-currency online wallets around for a while. Exodus however is the first dektop multi-currency wallet I know of.