Teleport for the Mac is a nice program that allows you to control multiple Mac computers from one mouse & keyboard.
Teleport is Mac only. If you are also using a Windows PC along with your Mac gear, you might want to give ShareMouse a try:
ShareMouse seamlessly works with any combination of Apple Mac OSX and Microsoft Windows computers.
It is probably the tightest combination of Windows and Mac, second to vmware Fusion.
ShareMouse allows you to drag & drop files even between Mac and Windows computers:
Start trying ShareMouse within a minute…