Amazon is entering the search engine space with A9. They have the 7 reasons A9 is cool. There are some cool features:

• You can search books - this is a cool bridge between the collection of the knowledge on the web and the collection of information in books.
• They display info on sites, in a floating window, and you can tunnel to an area on Amazon with more site info including reviews.
• Your search history roams including which results you've visited
• They've got a toolbar, like everyone else.

I can actually see myself switching to this as my primary search engine. The search results are powered by Google.