Integrating a Rails 3 application with Google Health

Anybody know of some good tutorials on integrating a Rails 3
application with Google Health? Or at least how to utilize the Gdata
gem?

I am looking to build a Rails 3 application that authenticates with
Google Health along with reading & writing information between Google
Health.

I have installed the Gdata gem but would like to see some examples,
tutorials, etc.

Thanks.