Nokia 7650/3650 and SE P800 are new Symbian based phones that are SyncML compatible and hence could be made to work with iSync, however current versions of iSync arent actually able to use SyncML via Bluetooth at all. They use IrMC which is a variant of IrDA. Apple plans to use SyncML, but has needed to wait for an implementation of SyncML over OBEX (Bluetooth). Currently SyncML works using HTTP/GPRS in most phones implementing it. Since apple has included bluetooth support for the aforementioned phones in 10.2.5, it stands to reason an iSync update should be very far behind to allow for full synchronisation, its a matter of adding SyncML/OBEX support and A conduit for Symbian OS. Im pretty sure that 3rd party progs will pop up too, as Symbian is an open source OS
The 7650/3650 can be used as a inet access point, file transfer works, app installations can be made via BTE, and SMS/Contacts work through Address Book (for this you must export vCards and sned using BTE)