Before you buy, Check out the new Belkin OmniView four-port KVM. It also switches audio and Mic connections. It also has some supplemental modules that'll let you extend the console over UTP, and has some other modules that interface Macs and Sun (13W3 Video). It's got a form factor like like a cable modem, has hot-key switching (or button on the front), or scanning (sequential display of the connected systems).
I'm liking it alot, check it out.
FWIW
Scott