I believe SBP (aaronsw's digital executor) is planning to make sure his domain is maintained and all the content remains available. But I do think it's nice to have this stuff in non-HTML form--ePub especially is great.

Be sure to ping rememberaaronsw@gmail.com (Aaron's friends and family) and let them know.

Also, did you look into using html2text (https://github.com/aaronsw/html2text) to generate the Markdown? Might be a fitting tribute to try it. It would be helpful to include the generating scripts in the repo no matter what.