I recently discovered Google Notebook. I'm still discovering the full functionality of this feature, but I figured out a use that is coming in very handy for me.
I use our online library catalog all the time to check if our library has books and request them. I often need books for our history studies and need them particular weeks. One feature I wish our online library had is an ability to save lists of books I will need to reserve at a future date. I am often misplacing my list of what the library has and then forget to request the book.
Enter Google Notebook! I made a notebook for library books. I copied the URL for the book search result and add it to the notebook. In the comment section of the entry I put the name of the book and the week I will need it. Ta-da!
This makes my life simpler and it's nifty neat-o, too. :)