"10 Years of Dr. Manhattan"
Watchmen is hardly the first movie to try to employ web-based spinoffs as part of its marketing campaign, but it may be the first one to have actually done it well. Here, for example, is a YouTube video of a 1970 NBS broadcast taking a look back at 10 years of Dr. Manhattan:
For many of the same reasons that Watchmen was long deemed unfilmable, it seems uniquely well-suited to this sort of thing. It’s not a literal adaptation of the interstitial material in the book, but it’s true to its spirit.