Official Google Data APIs Blog: 3. 2. 1. Contact. The API has landed
We’re happy to announce the availability of our Google Contacts Data API that gives programmatic access to your contact list. The contact list is shared among Google applications like Gmail, Reader, Calendar, and more.
macosxhints.com - Export Address Book to records to CSV format
I wanted to be able to move all of the info for my Address Book contacts into my GMail account: phone numbers, addresses, etc.