Having a KVM switch can help with this, but only lets you use a single monitor at once.
There is a great bit of software for Windows and Linux called Synergy2 that lets you share the keyboard and mouse from one computer between multiple machines. Synergy does have a Mac OS X port, but in the author’s own words it is “incomplete”.

Fortunately, there is a great bit of donation-ware software for Mac OS X called “Teleport”. This essentially does the same thing as Synergy, but in a nice easy to use Mac preference pane with full zeroconf auto-discovery of other Teleport equipped Macs, certificates for authentication and the option of encryption. It can also synchronise the clipboard between two Macs.
Take a look at http://abyssoft.com/software/teleport/ to download it, and if you like it as much as me then I would encourage you to donate.

The post Sharing one keyboard and mouse between several Macs first appeared on Spheron1.