Sounds like a good idea. After a considerable length of inactivity we've had some great translation contributions from github use ocha-. Taking it pretty much to the finish line. I'll do some proofreading too, as I know he's not a native English speaker. I guess epub formats etc would make sense too.

I'm happy to contribute, too -- let me know if you're interested in any help with editing or creating/maintaining a PDF.

Absolutely :) https://github.com/ruby-hacking-guide/ruby-hacking-guide.git... I'm taking the approach of trusting first, so if your first PR isn't insane, then no reason not to add you to the team.