A tiny application by Ben Borofka (freeware) that alllows you to update your GMail (GoogleMail) account using the contacts held in your Mac Address book.
The csv created by the a to g has the correct categories for Gmail. During import Gmail won't overwrite stuff, it asks you to confirm things such as differing phone numbers. Quite slick and doesn't lead to conflicts like some other applications.
You can review the results in Gmail contacts section to alter anything you like after import.
Update: March 2008 updated to enable all contacts to be transferred, even those without email addresses in your address book application.
Title of this post links to: http://bborofka.com/atog/