Maybe I just have not been paying attention, but this is the first time I have ever heard of Google Notebook. I saw it as a widget on Google’s personalized homepage. It looked pretty neat, so I checked it out and found out they have a Firefox extension for it as well.

+ Learn More About the Google Notebook Extension!

For more help, check these out...

• Google Notebook Add-on (without the add-on)
• Google Define Tool Set
• Watch Your Google Reader Feeds