I had my first search referal from A9 today and to tell the truth this was the first time I had heard of this search engine. It has been created by Amazon and uses Google as it’s backend with extra data supplied by Alexia and a few other providers.
As A9 is fully owned by Amazon when I visited the site for the first time it recognised my Amazon cookie and logged me in to the search site automatically. You can log out if you don’t like this but when your logged in the system can keep track of your recent searches and loads of other very nifty features. One feature I really like is the side tabs that allow you to turn on and off different search types. A9 also have their own toolbar that you can download and install on your browser.
I’m still not sure about the tracking part of the A9 site but it could grow on me.