I just upgraded this blog. It was running the latest released version of Typo (version 2.0.6). It’s now running a development version of Typo from Typo’s Subversion tree, plus the patches that I posted here earlier.
One upshot of this is that threaded comments should now work. Feel free to play with them here. If you have any problems with them, then please send me mail. Thanks.
One other change is that comments are now formatted with Markdown, so it’s easy to use bold, italics, lists, and links. See the Markdown page for details; eventually I’ll add a blurb to the comment form explaining the simple stuff.