Free "Lisp Hackers" Ebook
I bought this a few hours ago and I already finished it: a fun read. If you are a Common Lisp hacker (or used to be one) you will enjoy reading about 14 hackers, how they use Lisp, got started, etc. I just plugged this book and Leanpub on my blog. Off topic, but if you are starting a writing project, check out Leanpub (I am using them for 2 book projects right now).