Greasemonkey Hacks is out
"Greasemonkey Hacks" was published early November in the O'Reilly hacks series. If you're into Greasemonkey or want to learn more about it, this book has many excellent hacks explained and provides a nice complement to Mark's online book on the topic, "Dive Into Greasemonkey".
I'm happy and proud to have contributed 7 hacks to the book, including "Trace XMLHttpRequest Activity", which is available online for free (pdf).
Thanks again, Mark, for the opportunity and feedback. It was a great learning experience and lots of fun!