Did you know you can see what advertisement categories Google will offer you?
You can even customise them to show things that you want to see!
Google's catchup to facebook connect is in action still, with updates/releases to the API made yesterday to allow better integration with other services.
In particular I was interested in using it with Drupal, and found this post: http://code.google.com/p/google-friend-connect-plugins/wiki/DrupalPlugin which was just updated on the 12th, so should be a very good introduction, and there is a drupal module already, which is great.
I'll try it out later and write another blog post.