A9 and Amazon's "Search Inside"

A search engine with some cool features: A9 searches the Web (with Google), but it also uses Amazon's "Search inside the book" feature, to search the full-text of books that publishers have permitted Amazon to make searchable. You can also customize A9 to let you search the Yellow Pages, the Internet Movie Database, and various reference books -- simultaneously with one search box. But what I like most about A9 is that it keeps track of your old search terms (ok, that's kind of creepy), but it could also be helpful if you get the same question again a few months down the road. More reasons to use it:

• Why use A9?
• A9: My new best friend (from Mary Ellen Bates)

Some time ago, I had to try to find everything someone had written about a particular topic. I tried the usual suspects (Nexis, etc.) but the guy had also written a memoir, which of course was checked out of the library. So I looked up his book in Amazon, and luckily it let me "Search inside the book." Even if his memoir had been in the stacks, it would have taken me ages to page through it for relevant quotes, because the book had no index. With Amazon, I found the relevant pages with just a few searches. The downside: Amazon makes it impossible to print the full-text pages (understandably, for copyright reasons). But you can still read them, which is better than nothing.