I remember seeing this in a bookstore years ago, but I didn't buy it. Well, now it's free for download.

http://research.microsoft.com/~daniel/unix-haters.html

Mildly amusing. Some of the critiques are still true; others have long been addressed or are no longer relevant (do people think X is a "disaster" because it's a resource hog?) and then a bunch of the book is simply humor and trivia.

For all it's warts, I love UNIX/GNU/Linux and it's the best choice out there for me. Plan 9 is certainly not going to replace it, at least for me.