It's something we've wanted for a while
-- a single, unified place for all Windows notifications. If the latest leaked video of Windows 9 is any indication, it looks like we'll finally get our wish.
The video, posted to YouTube
by WinFuture on Saturday, shows a new unified notification center that appears in the lower right of the screen when you click a taskbar button. The notification center appears to work in conjunction with Windows' existing "toast" notifications and lets you see a rollup of recent notifications from all apps.