It work kind of okay, but formatting tends to get screwed up when doing this. Conversion with something like Calibre can give better results, but typically nothing's as good as a well-prepared epub or mobi.

I just did this for the book, the automatic Kindle conversion handled this particular book pretty poorly. Randomly long spacing between words or spaces removed and alignments destroyed in some spots. Not unreadable but it obviously looks like a conversion.

It's still better than reading a PDF on an e-ink Kindle or phone sized screen, it's just a bit messier. Sometimes the Kindle conversion works superb though, it's just a crapshoot.

+1

Someone in this thread has made a wget copy (easily convertible to ePub), ask him to contact you.

Nevermind, the html version is still public: https://gettingreal.37signals.com/toc.php