For the last two weeks, I have been unable to sync a P900 phone with an Apple PowerBook using Apple's iSync application. Yesterday afternoon, I solved these problems thanks to a fellow Apple user Brandon Jenkins.
I have recorded my experiences in a PDF guide. I found the whole experience very frustrating and hope that this guide will assist other Sony Ericsson users.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040715064033679