Google Contact Sync for Mac

Looks like Mac users who have the latest OS X 10.5.3 update and either an iPhone or iPod touch can now sync their contacts between Address Book and Gmail.

This sounds great, except for the fact that you must have an iPhone or iPod touch to do this. I agree with Daring Fireball, why is Apple and/or Google limiting this feature to computers that sync with iPhones and iPod touches?