I had been wondering how to print to some of the remote printers in my windows-dominated environment: they never showed up in Print Center. Well, I sorted it out today when I tried printing on the command line with atprint and used atlookup to see what I could see. It turns out I needed to initialize printing with AppleTalk by running at_cho_prn as root. This puts a default printer name in /etc/atalk/atprint.dat and all is well. After that, all other AppleTalk device show up just fine.
And I was amused to discover a few Macs on the network, not all of which are officially sanctioned by computing control.