I've just discovered that Pyblosxom's default (i.e. builtin) RSS template does not include dates nor IDs. I'm disappointed. This kind of breaks the whole "usable out of the box" feeling.
Google to the rescue: after a brief look at Blosxom and RSS and Daniel's pyblosxom RSS templates I've borrowed Daniel's story.rss with a different timezone substituted. Doesn't pyblosxom have a variable that would expand into the server's time zone? What about daylight savings time -- do I have to edit story.rss twice a year, or what?