There's a bunch of really good stuff in Red Hat Magazine that should have gotten more attention. It really is good stuff, I'm not just saying that. ;-) The things I thought were most interesting from a desktop developer point of view:
Seth's article can address a couple audiences; for GNOME, it's a good introduction to what we can do to improve usability beyond HIG compliance. Our development process doesn't always include the design steps right now. For the non-desktop-developer crowd, it's a good introduction to "what is up with those crazy UI programmers?"
You can also learn how gcc works though I'm not yet convinced that I want to know this...
The Register has its issues, but I did appreciate the title of this article. At least with Yahoo! you can sort of see how the name makes sense; unlike this competitor for a "worst product name ever" award.