I didn't realize it was free online. I was looking to purchase AI: A Modern Approach in eBook format, but you can only rent it, which is annoying. Maybe I'll still buy this one instead to support the authors.
i do highly recommend that book, but yeah, i'm not sure it exists in ebook format. Though, personally, when it comes to dense reading material, I prefer a book or even pdf that's a bit easier to page through.
I actually own the most recent AIMA in paper format, I just wanted it in a more convenient one. I've been looking at book scanning services, but that has issues too.
https://news.ycombinator.com/item?id=8350681
https://news.ycombinator.com/item?id=1376318
https://news.ycombinator.com/item?id=1294420