Nice, I forgot to search for alternate sources. It's a very nice gallery (with some maths too) of fractals, I'd be happy to have other sources for more complex and recent knowledge about them.
It's literally a button there. "Read Online".
Weird, so eager to read the main content I only saw the 'Buy the Book' button at the bottom. Too used to leanpub layout methink.
Well, it looks like a nice book and you can read it online or download it (there's a link at the top). The "Brainfilling" title is probably a pun to make the title more interesting.
And with it's big colorful pictures it would make a great and nerdy cofee table book.