I wrote over 30000 words for myself when I was reading and summarizing it. I then shared my notes with friends who were aspiring rationalists but didn't have time to read the book. They were blown away by my notes, and strongly encouraged me to share them publicly with the LW community.
This is what I did with the LW Wiki article, taking the time to upload my notes, format them, and reformat them based on requests. To answer your point below, the article appears to me to right now be mostly bullet points and short paragraphs. I'm using Firefox, don't know about how it comes out on other browsers.
I see more bullet points and short paragraphs now (in both Safari and Firefox), but after "Longer summary" it reverts to a wall-o-text per chapter.
I've made very extensive notes, along with my assessment, of Daniel Kahneman's Thinking, Fast and Slow, and have passed it around to aspiring rationalist friends who found my notes very useful. So I though I would share these with the Less Wrong community by creating a Less Wrong Wiki article with these notes. Feel free to optimize the article based on your own notes as well. Hope this proves as helpful to you as it did to those others whom I shared my notes with.