I am really unable to understand why they did that. but why not putting some publicity as they did with gmail?

Maybe it was a service too expensive to give without any charge. The search wiki and google bookmarks are two different services which are unable to give something nearly comparable to the notebook experience, it seems all notebook users understood this, but not people at google, it is something I really cannot understand. If I am looking for tutorials about the use of linux rsync the page I found will not be a place where I will go back very often but I need them to be saved somewhere with my notes and everything put together in a easy to find and re-read way. There are two types of bookmarks: bookmarks of sites we frequently read and bookmarks of pages we saw once and we need to keep somewhere in order to find again in the future. it was the best way to create a structured library of bookmarks! but google notebook was not for tasks or for creating docs. Yes google tasks is very good at keeping track of tasks. Google notebook was perfect for making very fast searches on the web. Internet Explorer users that want to download the Google Notebook add-on can try this link: xpi file to your browser and install the extension. Save the file, close Notepad and update the archive. Right-click on 'install.rdf', select 'Edit' and replace '3.0.*' with '4.0.*'. * right-click on the extension (google-notebook.xpi), click on '7-zip' and then on 'open archive'.

* download 7-zip, an excellent open-source software for archiving files, and install it. * save the extension to your computer: right-click and select 'save link as'. If you use a beta version of Firefox 3.5, here's a way to install the extension: I don't know for how long you'll still be able to download the Firefox extension from Google, but here's the download link: Google Notebook's integration with the browser is what made the service very powerful: you could copy the text from a web page in a notebook with one click. The only alternative to the Notebook add-ons is a bookmarklet, but it's too basic and the confirmation message is annoying. It's probably a wise decision, since new users can't sign up for Google Notebook and Google won't be able to make sure that the add-ons will be compatible with the future versions of Firefox and Internet Explorer.

Now that Google Notebook is no longer actively developed, Google decided to hide the link to the Firefox extension and to remove the Notebook support from Google Toolbar.

Google toolbar for firefox 8.0 download