Sadly, everyone's favorite search engine and web application provider, Google, has decided to discontinue development of its Notebook utility. I discovered this when I finally decided to upgrade my Inspiron from Ubuntu's Jaunty Jackalope to Karmic Koala , and found that no Notebook extension exists for Firefox 3.5. While the developers at Google don't offer any explanation as to why they decided to discontinue development, the advice they offer seems to suggest that they consider much of its functionality redundant with other services that they offer. Once I learned that Notebook would be retired, I began researching the alternatives discussed below.