Does a DVI KVM Solution Exist?

clichekiller asks: "I'm looking for a way to share my Apple 23" LCD between my Dual-G4 and my Athlon PC. I know that I'll need to upgrade my PC video card to one that has a DVI connector on it, but I haven't found a DVI Switch yet. Is there a simple way to share an LCD between two computers? Has anyone managed this between a Mac and a PC? I'd really like to ditch my behemoth 70 lbs. 19" monitor."