Apple’s release of OS X Leopard 10.5.3 Update last week now allows users to sync their Mac OS X Address Book with Google Contacts.
“We’re happy to tell you that starting today, [May 28] it’s easier to sync up your contact lists. The Address Book application in Mac OS X 10.5.3 now lets iPhone users sync their Address Book with Google Contacts. To try it, go to the Address Book menu, choose Preferences, and then check Synchronize with Google. It�ll ask for your Google account and password, then automatically update your contacts every time you sync your iPhone,” Mike Morton wrote for the Google Mac Team. 
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The feature is only available in OS X Leopard, version 10.5.3 or later.
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