Google constantly amazes me, especially when I discovered just a few days ago that Google had been keeping my search history whenever I search logged in. I have been using Google's personalized ig homepage for several months now, which requires me to be logged in with my gmail account to use. If I make a query over to google.com/searchhistory, I am greeted with an intuitive interface that catalogs all of my personalized searches, search trends and bookmarks. Yup, Google can store bookmarks for you! There is even a nifty Firefox extension to save bookmarks on Google, similar to the del.icio.us extension. This is great for those with multiple computers that want to share the same bookmarks.
Just some of the trends Google's Search History can show.