(Via webmasterworld.com)

The aggressive marketing campaign for Amazon's recently launched search engine has begun.

If you login to use A9, then go to Amazon.com, the famous Amazon logo is changed to advertise the new ^Π/₂% program, which gives you 1.57% off items you buy on Amazon.
The discount is made possible by the text links embedded in the search results on A9, and is a reward simply for using A9.

Clicking the logo brings you to this page:

How can we afford this additional ^Π/₂% discount?

Because of sponsored links (the small text-based ads you see on search results pages), web search has turned into a highly profitable business. The search engines are making a significant amount of money every time someone clicks on one of those ads. With our automatic ^Π/₂% discount, we are effectively sharing with you some of the money we collect from sponsored links, i.e. sharing the pi.

A9 has received mostly positive reviews since it was launched officially and is definitely a big development in the search engine competition going on.

Brett Tabke, administrator of webmasterworld had this to say: "I think other search engines are going to wake up on this in a hurry." about the History saving aspect of A9;

and John Battelle, who writes a very popular Searchblog, said:"... if A9 catches fire, Amazon will have created some valuable online real estate that might very well challenge the lead Yahoo and Google have in search."

More info:
·A9.com review by John Battelle
·A9: The next big thing?
·Nice going, A9
·A9.com Launches With Major Updates
·Why Use A9? - Official featurelist