Two thumbs up is what I have to say! If you are looking to use mutliple machines to do your work and are looking for just a WONDERFUL way of performing just that, try Synergy. I am writing this post while going between two seperate computers, two seperate monitors and two seperate operating systems.
In other words, I have a connected at the hip set of machines that I can use. Good job Synergy team!! One suggestion, follow the install and setup instructions closely to save yourself any possible headaches. The install is really quite simple and painless if you know the direction you are headed.