What was happening was that under v.2.5 the device itself was appearing in the Bonjour wizard -- but only very briefly. The moment I'd try to select its driver, it would vanish, and the wizard would say the printer was no longer available! Others confirmed this same symptom in the forum with other printers, so it wasn't just me. 
Parallels suggested the printer sharing trick, which worked to get the printer to stay (it had an "@ Eric Westby's computer" appended to it in the list), but as I mentioned, the resulting driver wouldn't print.
However ...
... just now using v.3, I tried once again selecting the printer itself on the network (not the alias on my computer) and it worked. And saints be praised, I could print to the resulting driver! So all's well that ends well. At least until the next build.
Last edited: Jun 22, 2007