I've been visiting the Internet Archive for years and I don't know if I've somehow missed this all along or if it's a recent addition. The
Million Book Project is precisely what the name implies: a project to digitize a million books. Some 14k books are now posted and many more are currently listed but still in preparation. There are some wonderful books to be found here: great literature, science, math, grammar, history, etc. I just downloaded a book of Omar Khayyam I'm anxious to get to.
I hope I'm not out of line in posting this since it isn't about a particular book. I just thought it'd be a shame if this excellent and improving collection of online books went unnoticed by any of the book lovers on this forum.
Dog is my copilot.