Each post included a summary of its individual findings and an explanation of how it fit into the overall series.
The articles were packed with links and footnotes.
She went back to add corrections on multiple posts when she (or commenters) noticed mistakes. While it’s good to acknowledge in a comment when you change your mind, it’s even better to adjust the post in this way, so that readers don’t need to dig into comments to get the most up-to-date version of a post.
Overall, though, I don’t think I need to say much about the posts — they speak for themselves. (If that’s not enough, Alex Tabarrok also speaks for them.)
This post was awarded an EA Forum Prize; see the prize announcement for more details.
My notes on what I liked about the post, from the announcement: