Buy.com
carries the
Iogear Wireless 802.11B USB Print Server 
for $70 -
$50 rebate = $20 shipped free. If you have a wireless network, simply connect this to your printer and any computer on your network can print to it wirelessly. Much better than just sharing a printer that is connected to one of your computers because with that setup the computer the printer is connected to has to be on to print to it. Be aware this only works with USB printers.