Windows 7 includes a new Jump List-based utility for finding and connecting to all the last Instances of the application in the Taskbar. As an e.g. here in the Screenie above Application MS Paint when clicked shows
the last instances i.e. all the last files where the application MS paint was used.it is an easy 2 navigate or Jump list.
Each application will have unique jump lists which will correspond to the features unique to the application
whether it be recent files opened or common tasks like Paint : Last opened images WMP : Last played media Notepad : Last opened Text & so on.
"Windows 7 Tips: Jumplist in Taskbar Application"
Reference : www.WindowsVJ.com