Google Apps based application

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I'm in a similar boat Nogga, not a Google Marketplace app but a regular webapp trying to use SSO via Google Apps. I actually just posted a question like this on Stack Overflow: http://stackoverflow.com/questions/12808...ess-tokens

Basically I'm not sure of the next step after getting back a token from Google:
1) How should I setup my database to store the access_tokens or other user data
2) How do I reuse access_tokens so the user doesn't have to continually go through the OAuth approval with Google
3) Lots of other stuff I'm sure