I have a Laserwriter Select 360 attached to a G4 Dual 1Ghz through an Asantetalk hardware bridge. I turn the computer and all peripherals off at night, and before Jaguar, the printer worked perfectly. The asantetalk is plugged into a hub, which is plugged into the G4 through a second ethernet card in a pci slot. The G4 could always find the printer through the Asantetalk. After upgrading to Jaguar, nothing. I could still use the printer without a problem in OS 9, but it was useless in Jaguar. I searched through many forums all over the web, emailed asante for months (they actually blamed apple for screwing up the networking in Jag and said they had no answer).
I finally found a solution!! Not sure if I read it somewhere or if it came in a dream. Here's the answer: I still power everything up through a powerstrip, so I have one master power switch. After everything starts up, I go to the System Preferences, and to the Sharing Pane. Turn on internet sharing through the second ethernet card, and lo and behold, the asante lights start blinking. To be sure, I unplug the Asantetalk for a second. When it comes back on, it polls the network. You'll see the lights blinking. You should be able to find the printer through the Print Center. If you have problems, try option clicking the 'Add Printer' button.
I hope this helps some other lost soul...