Finding FREE(?) books via Google

You want to find free books on the Internet and don't know where to find them.

You use Google to do the dirty work and give in a query something like below

inurl:htm -inurl:html intitle:"index of" +("/ebook"|"/book") +(chm|pdf|zip)

The above query removes all the html pages and searches for folders like ebook or book (what people mostly use) and search for file types chm, pdf and zip

Please note that you will find illegal copies of books.