Jag sökte lite på Apples sidor om mitt problem (clp 550) och hittade följande:
Well I decided to open the box up and it works fine (duplexing and all) on both 10.3.9 and 10.4.2.
As others reported, installing with Bonjour seems to work but all jobs stop. If you follow the instructions given by a previous poster then it works very nicely:
You will need to have the correct drivers installed for 10.4 tiger to print over the network.You will need the post script drivers installed and add the printer as a network IP printer and select LPD then enter the ip address of the printer and select the SAMSUNG in capital letters and you will see CLP-550 PS, Select it and click next and select 64mb or optional tray if you have one and it should be ready to print."
Not sure why Samsung doesn't post more useful information on their web site, or get it to work with Bonjour, because it's quite a nice printer.