It's pretty simple right now. I only spent an hour or so on it and will post it to GitHub when I get some more time to iron out a few kinks.

Basically you open the XUL app for the service you want to access. It acts as a chromeless firefox browser and intercepts any links you click. If it's an external link it opens it in your default browser where you wouldn't be logged into google preserving a bit of anonymity.