I was unable to find any instructions on how to sync Google Mail, Calendar, and Contacts with my n900. So, I tried using the instructions for the Symbian v3/v5 phones. Two of three were successful. One of the successes does have a catch. So others don't have to spend the time I did experimenting here are the instructions for synchronizing Google Mail, Calendar, and Contacts with the n900 firmware v1.2009.42.11.