The most interesting bit of my Google Dashboard is the Account - "websites authorized to access" link.
That link showed all the sites that exchange data via my Google ID, including 4-5 I no longer use. I revoked their access.
Since Google owns my soul my Dashboard goes on and on -- but this was the one new thing I recognized. There are about 18 other Google Services I use that aren't on the Dashboard.
Google is my master.
My Google Reader Shared items (feed)