Aside from being a top-notch resource for web development stuff the design of webappers.com is well done. It’s a nice study to compare how the different screen size designs are treated here vs. how Smashing Magazine has handled theirs. They’ve had to handle much of the same problems visually.
Overall this is a nice treatment as far as the different screen sizes go. I really think the fixed navigation works very well in this case. The branding is minimal too, which keeps the design of the site itself out of the way of the content – how it should be IMHO.