Mac OS X Snow Leopard: The Missing Manual (Missing Manuals)

D.63. Printer Sharing

To share a USB inkjet printer with other Macs on the network, open the Sharing pane of System Preferences on the Mac with the printer. Turn on Printer Sharing.

To use the shared printer from across the network, open the document you want to print, choose File Print, and choose the name of the shared printer from the first pop-up menu.