I'm a sucker for any kind of "behind the scenes" articles on other people's work and especially a progression of wireframes into final designs. Having said that, the screenshots is pretty much all there is in the post, there isn't any explanation about each step or design decisions or why each screen iteration evolved the way it did. Presenting them flatly like that w/o context is like clicking through the wayback machine.
37signals often posts great blog posts with critiques of their own work or process, here's a recent example:
http://www.37signals.com/svn/posts/1525-writing-decisions-he...