That's, IMHO, one of the weakest point of Bitcoin. It's really hard to use.

People usually want to send money to someone/some organization and:

- Trust it's the good person
- Be identified as the sender
- Add a message (like "Happy Birthday from your grandma")


Bitcoin does not provide that and, IMHO, it will be a critical step to make bitcoin acceptance easier.

Could we do it on top of bitcoin. Yes, I believe. But it means designing a *protocol* on top of bitcoin. The transport could be XMPP or HTTP, I've wrote some ideas about it there: http://ploum.net/post/building-your-web-identity