My home computers are pretty uncomplicated; an iMac at a conventional desk in the office and a Mac Mini at a standing workstation in the home theater, attached to the projector -- but my office setup is arguably where I've put the most effort and thought. I have five computers at my desk, serving various purposes. (Some are on a stand-alone development network, one is a version control server, one is my internet box... etc.) So needless to say, a KVM was one of the first necessities, there.
I also have three monitors across my desk. The KVM connects to the center 20" display, while the flanking 24" widescreen displays act as secondary displays on one or more computers. None of my computers actually support all three monitors, mind you... but most of them support at least two. Just for fun, I've also copied the same collection of panorama desktop backgrounds to each workstation, so that I can view a contiguous background image across all three displays, regardless of which machines are currently active.
Over time, I started thinking about the idea of having a standing workstation in the office, because I kind'a like the one I have at home, and because everyone has always lauded the health benefits of standing more and sitting less... but getting the Powers That Be to sign off on an expensive new adjustable height desk would be nigh impossible. So I designed my own "poor man's" standing desk. It's still the same desk I've always had, but now there are three stacks of old software engineering books (which nobody cares about) under the monitors, elevating them to standing height. I also used a bookshelf supported by some steel paper organizers (again, which nobody cares about... because who organizes hard copy papers anymore?) to elevate a keyboard and mouse appropriately. As an added element, I connected up a secondary keyboard and mouse on the desk under that bookshelf, so that I can sit down when my legs grow tired.
And they do. I don't think I'll go to all this effort again, when I finally leave this job behind me. Maybe I'll just hit the gym more often, instead...