Surprisingly, at least to me, I think the chapters on marketing are some of the more interesting ones for the HN audience, and have aged pretty well.
It's quite a high level book, so doesn't go into anything in TOO much detail, but instead is supposed to give an entrepreneur - even non-technical - a good understanding of most aspects of building a web app (or at least, what that consisted of a few years ago).
The dev chapters probably won't hold much interest to HN visitors (as they'll know much of the advice), but the marketing ones, maybe some of the design ones, might have some new insights if you've been focusing mostly on tech in your day to day work.
Given the breadth of information covered, I think you did a remarkable job on providing one of the better, succinct and balanced introductions on the Search Engine Optimization chapter (#23). If I could make one suggestion - your alternate text attribute markup for the images is non-descriptive at best.
It's quite a high level book, so doesn't go into anything in TOO much detail, but instead is supposed to give an entrepreneur - even non-technical - a good understanding of most aspects of building a web app (or at least, what that consisted of a few years ago).
The dev chapters probably won't hold much interest to HN visitors (as they'll know much of the advice), but the marketing ones, maybe some of the design ones, might have some new insights if you've been focusing mostly on tech in your day to day work.