A handy device if you have a PC and a Mac and want to save space.
Connect one PS/2 keyboard, one monitor and one PS/2 mouse to the KVM switch, then connect the switch to your PC (PS/2 ports, video) and Mac (USB port, video). Switch between the computers using a simple hotkey sequence. All cables are provided. (In fact, they are permanently attached. See the pictures.)
TRENDnet TK-209i KVM links:
http://clusty.com/search?v%3aproject=clusty-images&query=TRENDnet%20TK-209i%20KVM
$30.