We usually use the IP Printer option in Mac OS X when setting up network printer in our environment. We got this shiny iMac with Intel Dual Core processor the other day and had tons of troubles setting up a Samsung ML-2551N network printer.
First, we tried IP Printer with either Samsung driver or the generice driver. Both didn't work. After 20 minutes or so, I was about to give up. I decided to try Default Browser in Printer Setup. The ML-2551N showed up as two entries. One with Bonjour connection and the other with Appletalk connection. If I set up the printer using the Bonjour connection, it still doesn't work. Finally, I set up the printer using the Appletalk connection and it works perfectly afterward.