Source: http://feeds.gawker.com/~r/lifehacker/full/~3/221875110/share-your-keyboard-and-mouse-across-computers-with-input-director
Windows only: Share a single keyboard, mouse, and clipboard between multiple Windows computers with freeware application Input Director. Similar to the cross-platform keyboard sharing app, Synergy, Input Manager offers an easier setup and a handful of really useful features—including the ability to copy and paste files and folders between systems (a feature that never seems to work correctly in Synergy). While Synergy is the best available solution for a multi-platform setup, if you're only running multiple Windows machines, Input Director looks like the best solution. If you happen to have an all-Mac setup, check out previously mentioned Teleport. Input Director is freeware, Windows only.
