Google Web History and Google Reader
In case you’re not using it already, Google’s web history is a free and handy way to find useful links that you forgot to bookmark. I use it quite a bit when when I google search bugs and installation problems that I need to look up later. It can keep track of (1) all of your Google web searches and links you visited from those searches, and optionally (2) all of your web history (not just Google searches)