Another change that Snow Leopard brings is the removal of AppleTalk printing support. It’s not that big a surprise, but it would have been nice to know about. In any case, the solution is to add the printers by IP to a Leopard or Snow Leopard server and enable Print sharing. The printers then show up to clients on the network as standalone Bonjour printers.
“AppleTalk note: If your printer can only use the AppleTalk protocol, the printer must be connected to, and then shared by, an appropriate AppleTalk-capable printer server. Snow Leopard can then use that print share to print via a supported IP-based protocol. See the “How to add a printer” section of this article for details about how to connect to a shared printer to your Snow Leopard system.”