Apple has released iSync Update 2.1.
The new version of the synchronization software is available through Software Update.
It’s also listed on Apple’s Support pages with a link to a direct download.
Apple’s customarily brief accompanying notes explain: "iSync 2.1 supports compatibility for more devices such as the latest Motorola, Nokia, Panasonic and Sony Ericsson phones.”
A comprehensive list of iSync compatible devices is available on Apple’s website.