Pentax Pocketjet II (and possibly other printers w/ Parallel to USB issues)
Leopard would not recognize my Pentax Pocketjet II printer. It was driving me insane. Called Pentax tech support, they were sympathetic but didn't really have an answer, other than to say that these printers were not originally designed for USB (they designed the converter cable after as a workaround) and that they did not give out a USB serial number in the way that more recent models would. And that perhaps the OS (Leopard) was not recognizing it because of that. Their drivers DID install (written for OS X but pre-Leopard) but my Macbook Pro did not recognize the physical existence of (or connection to) the printer. Anyway, to make a long story short, after trolling these boards for an hour, I found some references to people with HP printers with similar issues, and (god bless him) some guy posted a link to a program called USBTB -- and it worked beautifully! I'm posting the link below. And, if it works for you (as it did for me), by all means -- BUY THE KID LUNCH!!!
http://buymelunch.org/printing/usbtb/
http://buymelunch.org/printing/usbtb/
Macbook Pro, Mac OS X (10.5.1)