Get Organized With Google Notebook is a nice article that talks about working with Google's fairly new notebook.
I like the notebook more than I do Google's calendar or Gmail. However, the problem for me is that Google is mixing together different types of services and trying to use one Google login for all of them. I don't want to use one login for AdSense, AdWords, Gmail, etc., etc. so I'm faced with having to logout and log back in just to check stats or to make a note. Or run two browsers, one for personal use and another for business.
Google: I like your apps but please stop forcing me to have only 1 "Google account" active at a time.