We recently covered an awesome tool from The Garage that makes you control up to 4 computers with only one set of keyboard and mouse. Since now we have the preview of Windows 8 released, I went ahead and gave it a try to see if the Mouse Without Board makes no boundary between Windows 7 and Windows 8. It turns out it works great.
Before you do the installation make sure turn on Microsoft .Net Framework 3.5 feature from Control Panel and Program window.
Then follow the instruction described in this post and you are good to go.