Rather than address the items on his list (The Tomboy notetaker, Beagle search tool, and F-Spot photo management all make the list) I suggested that the application most important to you is the one you're using. In my own case, that would mean Open Office and Firefox.
Perhaps that was too flip.
Because Uhlman was aiming at a more important point. There are, in fact, great desktop Linux applications out there, applications that can replicate not just a basic machine, but most anyone's machine.
This is not known by most people, because open source squeezes out marketing. Getting the word out on our great desktop Linux applications should be an important goal for 2007, and beyond.
So which open source application do you think deserves more publicity?