The other nifty feature I've been playing with is statistically improbable phrases and capitalized phrases. Go to a book, like Rick Bayless's cookbook. Scroll down to the "inside this book section", there are phrases that Amazon has guessed are significant. If you click on one, say "pork country ribs", it'll give you a list of all the books they sell that contain the phrase "pork country ribs" with a bit of context.
I noticed that you can tweak the url's a bit to search for any phrase in any book:
(Or get my firefox search plugin.)
And now I'm running off to work on the house again.