I've been using sneakernet (copy to a flash drive, remove, walk to the other computer, insert, and copy to other computer) and gotten along fairly well.  But it's just been a bit of a pain printing recently.  Reading some of the linked pages I found this.  Anyone use something like this before?  Kind of a KVM switch for printers.

Cables Unlimited 4 to 1 USB 2.0 Automatic Switchbox
Cables Unlimited's premium 4-port USB 2.0 auto sharing switch is the ideal solution for sharing a printer or any USB device between up to 4 computers. This compact auto switch installs in seconds and supports both USB 2.0 and USB 1.1 devices. Convenient software, hotkey or push button switching, guarantees quick and reliable computer selection.