Use Amazon to Search Your Books
I have started using Amazon.com to search books I own for a particular passage. It’s infinitely easier then linearly scanning through the book. It even beats out the book’s own index. Both in ease of use and completeness.
After reading an undisclosed number of pages of a book online, Amazon won’t let you see any more excerpts. So if a search result looks promising, I look it up in the book, rather then click the link, just in case. Google Books may well have a similar restriction. I don’t know, I don’t use it as much.
For ingesting a large chunk of information, books are still king. But for searching they’re pretty bad.