blockchain info: send via (email, SMS, facebook)

Send To Anyone

Send Bitcoins to anyone via Email, SMS or Facebook even if they don't have
a bitcoin address or a My Wallet account.

How it Works.

A new Private Key is generated using javascript.
The Private Key is sent in a message with a claim link.
Upon claiming the private key is swept into the User's wallet or sent to a
desktop client.
A Copy of the private key is kept in the senders wallet so they can reverse
the payment at anytime until claimed.

https://blockchain.info/wallet/send-via

I think this is quite an innovative service...