Hi all, we've released the GoogleApps-Moodle integration via SAML/OAuth.
There are a number of articles about it:
Campus Technology: Google Collaborates on Moodle Integration
Moodlerooms Integrates Google Features with Moodlews__node/28/
Moodle joins forces with Google
The code is available from:
http://development.moodlerooms.com
There are lots of tweets about it:-)