It's so good to see Microsoft doing this, after not providing anything for the Zune itself. Much better than paying $39 to MarkSpace for their software (and no doubt they WILL develop software for Windows Phone 7 that will add more synch options). I believe almost all the major Mac sites have carried this news and I hope this gamble pays off will enough for MS that they'll continue to refine and improve the software. Heck, even Android doesn't have a native sync client for Macs (DoubleTwist is 3rd party).
XBox 360 S, 16GB iPhone 4S, iPod Classic 160 GB, Dell Inspiron Mini 1018; Macs: Mac Mini 2.4 GHz 6 GB RAM; Macbook 2.0 GHz 3 GB RAM; MacBook Air 11", 24" Cinema Display