Making an elegantly-designed and easy-to-use application is just as gnarly, even though, like good ballet, it seems easy when done well. Jason and 37signals put effort into good design and get paid for that. Good design seems like the easiest thing to copy, but, watching Microsoft trying to copy the iPod, turns out to be not-so-easy. Great design is a gnarly problem, and can actually provide surprisingly sustainable competitive advantage.

Where there’s muck, there’s brass - Joel on Software