From the comments: Getting Real was primarily about software development. Rework is primarily about starting, running, building, growing (or not growing) a business. There are some shared ideas between the books, but Rework was written from scratch. It’s a new book.

But I still think you're right: this is a book for people who buy business books in airports and read them on planes. Which is where 37s probably needs to be heading - my dad wears a suit to work and has never heard of them, but I think he'd get excited by some of their ideas.