Because of my desire to have blog.commonmonkeyflower.net and commonmonkeyflower.net/blog point to the same place, the way in which nexcess.net handles that, and my desire to have drupal use "clean urls", and the way in which drupal handles that, it seems a few requests Just Don't Work.

If you go to [www.]commonmonkeyflower.net/blog , you will end up in a page not found error. Adding a slash to the end of that, or a slash and some further internal page request, or going to blog.commonmonkeyflower.net, or anything except those two specific urls works.

Since my rss feed points people to pages that work, and since I think many of the people who have me in a blogroll link to "blog." rather than "/blog", I'm willing to accept this as a good enough situation.