I am not so sure about this approach. Although the message itself is encrypted you can still see who the messages are being sent to. It would be cool to have the names of the recipient and the sender encrypted. That way it would be a true private message.
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Yes, I agree and we can easily do this! We're working on it for the beta.
It isn't easy! The only way to hide receiver is for receiver to scan all messages. Sender cannot be hidden due to bandwidth enforcement.
Yeh gareth was explaining to me it would it would make it impossible to automatically reconstruct our database from the blockchain though unless we encrypt the "to" field using our own key. He said "it'll take a bit of time to engineer into a proper solution, but the basic trick is to allow each user to store an arbitrary block of data in our database, encrypted - and with deduplication"