Dan Bricklin has a post up called Software that Lasts 200 Years. It reminds me of this one piece of software that we use here that was written in the early 80’s, its dos based and is still used daily by a few people here. The reason its still around is that it still works better than “modern” software of its type. I’ve looked several times to find a updated package that works as well, and there isn’t one. The company actually had it written for a specific task and it does it well.