Belkin OmniView KVM Switch
It's done. My new setup is complete. I now have three platforms, Macintosh, Windows XP, and Linux all running through one monitor. I opted for two keyboard/mouse combinations, mainly due to the slightly different key controls and a missing feature in the OmniView KVM.
Upon setup, I noticed that you cannot plug a USB keyboard/mouse into the KVM to control your entire setup. You can only plug in a PS/2 keyboard/mouse and control other setups via USB or PS/2. A bit misleading, I think, but the end result was fine.
This is going to take a bit of getting used to, but I'm already so happy to move my Linux box from a 14″ monitor to a 17″ flat-panel. The output is so clean and LOTS of real-estate. I can see my development productivity skyrocketing already. 🙂