I accidentally discovered this today. If you do a Windows Key+Spacebar, it will bring the Sidebar and any gadets that happen to be off the sidebar to the foreground.
If you regularly use keyboard shortcuts, you can find that plus over 150 more keyboard shortcuts at http://itsvista.com/windows-vista-keyboard-shortcuts/
(Yes, the above link and others from ITsVISTA are included in Connected to Windows Bookmarks ;) )
Corrine
Yes, but that takes all the fun out of discovering them on your own :)