Well, a wiki doesn't quite do what I would want, because one of the most important parts is the automatic updating where items move up the list as their deadlin

Well, a wiki doesn't quite do what I would want, because one of the most important parts is the automatic updating where items move up the list as their deadline approaches or as they've been in my list for a long time. Having to constantly edit a wiki to reflect this just adds something else to the list of things to do, "Maintain to-do list". The site that danw referred me to was almost exactly what I was looking for.