Some of you may have had problems posting comments yesterday. That's because we're in the process of upgrading the blog to handle threaded commenting, and there was a template screw-up. We've reverted to the system default template for now; this means you must preview your comment at least once before you hit the post button. Otherwise you may get an error message.

We now return you to your regular featured programming, sort-of. (I'm off on Friday to Copenhagen for an SF convention, and will probably have neither bandwidth nor time for blogging between then and next Wednesday.)