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I used to use Synergy to control multiple Macs with one keyboard and mouse.

A few days ago, I decided to try Teleport. It is Mac-only, but that is not an issue, as I'm only using Macs at the moment.

I am quite impressed! Synergy requires editing a configuration file: not very user friendly. Teleport, however, adds a preference pane to your System Preferences, from there you can share your Macs screen or request to control another macs screen. All shared Macs on your network will appear in the list, allowing you to drag them to a location relative to your screen.

The only downside I found is that you can not put a Teleport-controlled screen next to another Teleport-controlled screen. All the screens controlled by teleport need "touch" your own screen.

The only solution I've found for this is "daisy chaining" Teleport instances. My Mac Mini is controlling my "hackbook" which in turn is controlling my girlfriends iMac (when she isn't using it).
This works over a wired network, but becomes way to slow to use when some of your Macs are connected via wifi.