Just a quick note. I've made some updates to the eBook. I read through it again and caught a number of typos (Gah!), but I also made a number of edits for clarity. I asked Amazon to send out email notice of the change so those who've already downloaded it can get the new version, but I thought I should mention it here too.
I'm considering replacing the posts here with the updated versions which are in the book. The benefit of that is that everyone can read the shiny and new essays here. The downside is that I'll lose the original versions because I won't bother to keep them. If anyone feels strongly one way or the other, let me know.