It's about damn time. When I was first getting a smartphone instead of a Palm PDA and a cell phone, I thought for a nanosecond about switching from the Palm platform to a blackberry, but the lack of native syncing turned me off completely. Now those with a Mac can choose between Apple, Palm and RIM without losing a vital attribute.
(yes, I know 3rd party solutions are available, but they all seem to lack something, IMO.)
It's pretty surprising that it's taken this long for RIM to get this done. The Mac has been growing in popularity significantly over the past 5 years, especially for home use. It's not like it's an insignificant portion of their potential users!