Apple has just posted an update for iSync, bringing it to version 2.1. It is available through the Software Update utility.

Here is the description of the update, as provided by Apple:

iSync 2.1 supports compatibility for more devices such as the latest Motorola, Nokia, Panasonic and Sony Ericsson phones. For a complete list of supported devices, please check http://www.apple.com/macosx/features/isync/devices.html