Google Tip:

Want some ebooks? Oh, yeah... google does that easily. Another power searching lesson coming right up.
Google: -inurl:htm -inurl:html intitle:"index of" +("/ebooks"|"/book") +(chm|pdf|zip)

What does all of this mean? The -inurl htm and -inul html is attempting to get rid of regular webpages and show just index pages. Looking for index of in the title is doing the same. Using the pipe ( | ) tells google to look for something OR something else. Here we are telling google to look for book or ebook directories... and we have listed several common ebook formats (zip, pdf, chf).

If you would like to look for a particular author or title just tack it to the end of your search.