A9 is the newest contender in the search engine world from Amazon. It's basically a front end to Google, Amazon's book search, Google Images, IMDB, and GuruNet, with some links to Alexa thrown in for good measure. I'm liking it a lot so far.
One of the features is being able to type in searches from my browser, for example a9.com/perl takes you to the search results for "perl". If you log in with your Amazon account, you get access to all your previous searches, and you also get a
See also A9 Launches New Version from John Battelle's Searchblog.