So this actually looks like a decent skill to know (computer-wise). Basically knowing how to do this will let you turn any website into an off-line web page. As per Jacobs request there will be no download provided and I'll be speaking in generalities for the rest of the time. Yes, you can use this to create an ERE book, but you could also use it to create an <insert favorite website here> book too. One huge positive that I can see is that you can read on an e-ink screen instead of a lcd which is way easier on the eyes.
@Jacob. I looked and it is already trivial to do what the original poster requested. It is just a wget command followed by a concatenate command followed by using an html-to-pdf converter. Also, I did make a kindle version of the ERE blog for personal use (and to test out the method below for creating ebooks) and the result was surprisingly good. Actually, it was borderline professional if I did a little bit of post-processing to remove the right-hand sidebar. Even without the post-processing the readability and navigability is pretty darn good. Let me know if you want it and I'll email it to you.
Anyhow, here is what I did:
First, I downloaded an entire website. http://lmgtfy.com/?q=mirror+a+website
Second, I created a Table Of Contents referencing all the web pages that I wanted to include in the ebook. http://manual.calibre-ebook.com/faq.html#how-do-i-convert-a-collection-of-html-files-in-a-specific-order
Third, I installed Calibre on my computer. http://calibre-ebook.com/
Lastly, I added the table of contents created in step two to Calibre as a book, set the meta-data, and then converted it to my desired ebook format.
And boom goes the dynamite, we have a static ebook of a website.
Tips: Download all the web pages to a single directory and then pipe a list of all the directory's files into your Table Of Contents file for the win. Otherwise you will be typing all night. ;-)