I think I've got it squared away now, but if you see something that doesn't look or work right, please let me know.
Also, let me know what you think of the italic blockquote style in this post. Do you prefer it, or the previous bold-type style, as in this post? Or do you not care?
Might have some substantive posts later, but this took a lot of my available time.
Update: Putting up this first post-upgrade post apparently screwed up the site pretty well -- notably by malforming the post itself and dropping the sidebar to the bottom of the page. Deleting this post didn't help; it simply malformed the next post in line. Working on it....