http://h34nug3iwqjf2376fmmzdhgqivckzemcujmarlptfqeqtq7vya47yyad.onion/2007/09/05/katapult-faster-and-easier-access-to-your-applications-bookmarks-and-files/index.html
Try it: walk up to a Windows machine and type Alt-space N, and watch the front window minimize itself. Very handy trick for keyboard lovers. Oh, well, one more key combination for me to rebind. But see how close to perfection you are? Maybe in KDE 4 you can take over Alt-F2.