Adding AJAX to the Admin Bar?

Alright, I am laying this in the hands of WPMU as no one else has a clue how to implicate something like this.
I am looking for a way to "AJAX Update" my Admin Bar (In particular- the Notification Orb) so users can get new notifications as soon as they are generated, as they hate F5 for some reason..? xD Any ideas are appreciated~
PS: Anyone with good answers will be gifted a nice amount of points~