Rating: 

I wasn't going to write a review, but I noticed that the previous reviewer insisted that the code examples don't work on X11R6. I can assure that although this might have been the case at one time, it's no longer true - I'm reading through the book, typing out all of the code examples on my Linux workstation which is running XFree86 4.3.0 and so far all of the code examples have worked exactly as advertised.

I am inclined to agree that some indicator as to which lines changed between one example and the next would be nice, but I wouldn't go so far as to say this series sucks eggs. I'm actually enjoying the book (I'm six chapters in), but I'm learning X because I'm curious, not because I honestly think I'll ever do any significant programming in it (I mean, honestly, who really uses X at the Xlib level?)