I signed up with Google Coop just now. It looks like a social bookmarking type feature?. I am still getting my head around it. I have never been really big on these types of things, but I am sure Google might be using these kinds of features to aid their search results.
I was able to make this page by following these directions.
You probably have to subsribe to my feed to get the same results.
It is getting to be a full-time job just keeping up with all of Google’s new features!