Twice before I've come across the blog called Joel on software, both times I enjoyed the entry I was reading, which I found as a link from some other site. Yesterday, on closer inspection, Joel's archives are considerable and he's also written a couple of books, one of which is available online and deals with usability interface design. As I started reading it, I'm going on chapter 9 and simply cannot stop reading. It is fantastic writing, in fact, Joel knows what needs to be said and how to say it. Needless to say, I'm going to keep an eye on that blog, it is also added to the list of links for your convenience.