Feeds is A Mac menu bar app for tracking activity on web services like Dribbble, Basecamp, and more.
Something similar exist on Unity for Ubuntu, but only for mail, twitter and IM.
And this is one of new features of iOS 5.
I’m pretty sure that it will be integrate natively on mac OS X and Gnome-shell.
Because I don’t need to receive an email for that, and I can look at it one time by day, if I want!