I really hope Mark is okay, and I'm really going to miss Dive Into HTML5. That resource had a truly unique writing style, featured a great design, and was an a absolute treasure trove of valuable information. I was literally on the site just yesterday, reading up on local storage.
His contributions to the community were released under liberal licenses and will undoubtedly be widely available tomorrow. Heck, you can `apt-get install diveintopython` on an Ubuntu system. However, a lot of links just got broken across the internet - and his books are popular entry points for novices. Hopefully when whatever is going on in his life cools down, he can transfer the domain names to a responsible custodian.
