Steffen – a friend of mine – has found a way to configure the Apple iSync software in such a way as to sync your Address Book and iCal with phones that are not yet supported by Apple, e.g. the Nokia N70, N90 or the Sony Ericsson W550(i). You‘ll need some basic understanding of scripting but all the rest is pretty easy and the instructions are explained step-by-step on his website: www.isync-hilfe.de (only German so far).