On his blog today, Mark mentions more about the changes to notifications coming up in Jaunty Jackalope. As many have mentioned, this past UDS was all about notifications and how Canonical/Ubuntu is working to implement these in the next release.
There is a nice video as well on his blog that was also shown at UDS as a conceptualisation of what they are working on.
The coolest part about the work on notifications is there will be no slider, button to close, not X or antyhing.
The other nice part is them not piling up when you are away may miss them. I often leave my laptop running as I get called away into a meeting or take a conference call and hate comming back to a stack of notifications on what happened while I was away.
I am looking forward to the changes that are comming down and am also glad that Canonical is looking to implment them in both KDE and GNOME.