Amazon have released a new search engine, it's called www.a9.com. It's not as 'clean' looking as google but it does have some interesting features.

Firstly, if you log on to the site (if you have one, use your amazon password) one can see a search history. This can be quite useful for those of us who found that exact item, but can't quite remember how we got there. Also, if logged on it will search the text of books, displaying a quote with page number and title. Very clever.