Joel on Software is the weblog of Joel Spolsky, former program manager of Microsoft Excel and an enthusiastic bike rider, among other things. This site is opinionated (”this site is not known for pulling punches”) and quite caustic to technologies he does not like (including several from his former employer), but the prose is excellent — clear and reasoned — and makes compelling reading even if you don’t fully agree with him. And there’s an excellent book on UI design on the site too, as a bonus. Required visiting for all those interested in, as the page says, “managing software.”