Ha, got it. comments_template(); was missing.
I’ve done that actually (should have mentioned). I copied the comments.php and comments-popup.php from both the default and classic themes into my photoblog theme, but neither did anything for me. I don’t see any form, nor any comments that have been posted. I commented on a post with the default theme applied and it worked. My photoblog theme shows that there’s one comment, but it doesn’t display when I click the link. The text about comments disappears, but there’s nothing else changed.
Ahh, so it was you. That’s my old photoblogger(.de) driven site, not my WordPress 1.5 site. I haven’t gone live because I don’t have all the kinks worked out yet. Sadly, my new site is currently on my notebook sitting behind a few corporate firewalls, so I can’t send you a link.