Why Google Notebook?

I recently got aware of Google Notebook, which, according to its own description, allows users to paste random selections from web pages, adding own thoughts and so on. While I understand that there may be some improvements over weblog usability, I fail to see the advantage over Weblog services regarding functionality. After all, cut and paste will allow me to copy Web content from almost anywhere. On the other hand, I do not really see how I can share my ideas actively with other users with Notebook. In other words, I do not really understand the need for this if communication is not really a part of it. Any thoughts?