If you want to add notes to Google Notebook; you can visit google.com/notebook or click on “My notebooks” from any Google search results page. To add excerpts from web pages, you need an extension “Google Toolbar 5 for IE or Google Notebook for Firefox”.
But If your browser does not support any of the above extension, you can still use bookmarklet to clip from web pages and view your notebook while you browse the web with Google Notebook bookmarklet.
To add the bookmarklet to your browser, just drag this link into your browser's bookmarks bar. (In Internet Explorer, please right-click on the link and choose “Add to favorites.”
To view your notebooks, just click on the bookmark. To clip from a page, select some text or images, and then click on the bookmark.
Source:→ Google System