One of the things that makes Joe Hewitt really stand out as a designer and a developer is that he doesn't let things get in the way of making it "just work." You can get a taste of this approach to software over at his blog where he's just posted iUI, a sweet little JS and CSS package that makes it super easy for developers to deliver iPhone web apps with an iPhone native feel.
Joe is one of the reasons that Firefox is kicking such ass today. His contributions early in the project helped to give Firefox a "just works" spirit that carries on to this day.