Suddenly can't see any printers!!!

Help!!! I suddenly can't see either of my printers... a very old LaserWriter 5800, and also a Canon color printer. I'm posting this via my Airport network connection, so that obviously works. I'm also seeing one of two other computers on the network under Shared in the Finder window. The other two devices I'm seeing are the Canon printer's Fiery processor and the Airport base station. I upgraded to Leopard almost immediately, and this only happened today. Any ideas? Thanks very much in advance!!!
Message was edited by: Steve Mouzon

Updating the situation (still need help!!!)... I restarted everything network-related (cable modem, firewall, switch, and Airport) and now I can see both printers in the Default and AppleTalk windows of the Print & Fax system preference, but ONLY when I'm hardwired into the network. When accessing through Airport instead of ethernet cable, I can only see Bonjour shared printers on a colleague's machine? Any ideas?? Thanks very much in advance!

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