Last February, I drew your attention to Harper Collins' free online browsing of American Gods. Well, they are doing if again, this time with Neverwhere!
You can read it for free or download it as a PDF. You don't get to keep it forever (the PDF will self-destruct in thirty days) but it's an excellent offering nonetheless.
I mean, I could go off on a tangent about how self-destructing PDFs is an example of "tethered appliances" taking over the Internet and taking away our control over what content we can access. Then I could casually mention Jonathan Zittrain's The Future of the Internet--And How to Stop It. But I won't.