Using USB As A KVM Switch?

Don Faulkner asks: "One of the features of USB that people are really excited about is the 'multi-headed support.' In other words, I should be able to connect several sets of [monitor, keyboard, mouse (and other stuff like joystick, printer, etc.)] to one computer, maybe distribute these throughout my house, and move seamlessly from one to the next. What if we turn this around? What if I wanted to control several computers in a rack, all from one location? This is done today with KVM (Keybard/Video/Mouse) switches, some of which are very sophisticated. Could USB do the same thing? Most computers have two USB ports, so you could theoretically daisy-chain the computers together, but this would be bad for reliability (take down one computer, and everything past it on the chain disappears). So, we would probably want to use a hub, and attach the head to that. Has anyone tried this? Anyone seen it done?" Here's an interesting sidenote: the USB 2.0 specs were just released. You might check out what they have to say about KVM switches.