timestamp and sign/verify bits of copyright material such as poems/ideas/etc. with the choice of making it private, public or designated for the recipient?
And maybe have the Bitcoin Foundation to maintain a searchable database of such submissions so it does not get out of hand.
Miners fees must be incorporated into the system as well to benefit community and filter the files/messages initially.
I understand that it can be done right now (in a way), but it appears to be needing much work still.
Also there should be an easy way to verify an identity of a wallet owner using just software/webcam. I foresee this as one of the major requirements for Bitcoins wider adoption.