I have been using Google Notebooks for a long time. The ability to grab info as I am browsing and then be able to access the links and notes from any web browser is invaluable. No more promising to send the link and forgetting to do it, I can get the link there and then.
I am adding links to some of my Google Notebooks that are related to the content of the site. You can check then out in the My Google Blogs section on the left.