To this end, I have a 17" antique Powerbook that I keep around. It's big and clunky, and with only a gig of memory running Tiger, it's none too fast. I keep it around because I have to use the Admin Tools, and that's about it. It takes up a lot of room on my desk, and having to turn constantly gets irritating, so a while back, I found a Better Way(tm).
Enter Synergy. It's a client/server program that allows one computer's keyboard and mouse to act as others' inputs. Sort of like a software based KVM, without the V.
On my desktop, I type synergys, which starts the Synergy server. On the client machine, I type "synergyc newcastle". You must specify the server, since synergy can connect to multiple machines at once, which would be fantastic for a NOC team with shared computers.
The configuration is pretty simple. In Windows, there's a GUI, but in Unix, it's a simple config file.
Here's the content of mine:
bandman@newcastle:~$ cat /etc/synergy.conf
left = guiness.local
right = harp
right = newcastle
left = harp
right = guiness.local
left = newcastle
It's pretty straight-forward. In my example above, I have three machines. Newcastle is my linux machine, and the keyboard / mouse host. To the (physical) right of it is guinness, the mac. To the left of newcastle is (sometimes) another laptop called harp.
When I move my mouse off the right side of guinness, I want it to wrap to the left side of harp (or newcastle, if harp is gone), I specify that harp is to the right of guinness. Vice versa on the left.
Anyway, if you find yourself with too many computers and not enough inputs, give Synergy a shot. It's a great piece of software that I've given a couple of my users, and they love it.