Just a wild thought. Is there a way to associate an email with a future-created bitcoin account? The goal is to be able to send bitcoins easily to an email address even though the recipient has not created a bitcoin account. The recipient can create an account later on to pick up the bitcoins. This would make it easier to seed wider usage of bitcoins. That's how Paypal started.

I guess this requires a trusted central third party as an eschew to hold the fund for the email recipent and for verifying the recipent's account via email.