Thanks to a pointer from zosa, we have our free book for today:
This book is an ad-supported PDF, where you get little contextual text ads that show up to the left of the actual pages. The author will get paid based upon the "click throughs", and seeing the ads is entirely an opt-in kind of thing. The ads don't seem to show up on my Linux box, but I guess if it isn't the latest and greatest Adobe version, then you don't see them at all. Which is unfortunate, because I'd like to support the experiment.
Anyway, as zosa says, it's an excellent compendium of 200 True Films, a genre I really enjoy. I'm looking forward to perusing it!