I've added an experimental comments feed suitable for the RSS blogreading tool of your choice. Comments recursively welcomed.
If this works I suppose I'll XML but I don't think there's an obvious way to make the comments feed do that, so the comments feed will lag somewhat.
Generally, I've been finding the blog is getting slower as the database grows. Some updates, and especially attempts to use MT-Blacklist to kill large amounts of spam, cause timeout errors when I exceed some limit set by my host…a limit they won't increase unless I get a box of my own, which would raise my costs tenfold. I gather this slowdown is a known MT 2.6.x behavior. For now I intend to live with it. In the fullness of time some sort of major upgrade or migration may be in order. In my copious spare time. Ha.