Now that you have two monitors, may I suggest you try setting up vmware or the like as a second virtual PC on one for when friends/kids family are about... or just to isolate a dedicated test envioment. You can even have VMware lock extra USB keyboards/mice to the virtual machine. Won't play games but saves the kids messing with things they shouldn't... and if they do manage to messup things or get a virus or what ever, just restore the VM image.
I have a AOC 22" @ 1920x1080 and a 2nd 19" @ 1440x900 for use in a virtual machine for app development. Saves on KVM and additional machines.