It's written 100 lines of javascript + jQuery, and the more enterprising could probably turn the code a bookmarklet as it can run entirely on the client side. Also works fairly well on iOS.
Hat Tip: Built on the Hacker News API: http://api.ihackernews.com/. Great stuff, although if you click a link and nothing appears, it's probably because the API returned a server error.
http://hncomments.com/
Over the weekend I hacked together Octavore, a mashup of Instapaper and Lulu, a self-publishing website. Now anyone can get their own personalized, dead-tree copy of the Internet's finest! Get a real copy of your favorite articles, stories, and essays for only $12.
Notes: It's built on Rails, so it might be a little bit slow as both the book generation and publishing take a while to complete and block the server while processing. There's no background workers or anything fancy as I only worked with what I knew to get it up quickly.
This is my first publicly launched weekend project, and I'm really excited. Comments, criticisms, and suggestions are all especially welcome, thanks!
http://octavore.com