I just discovered that it currently is not possible to comment on this blog. At first sight it looks like the problem is caused by the AJAX part that tries to publish the data to another domain.
However, it has been a while since I last touched the templates, and the commenting feature worked fine in January, when I received the last comment.
When I have time I will try to fix it or I will simply remove the fancy AJAX part. I’ll keep you informed.
[Update 2009.03.16] I have removed all AJAX stuff from the templates, so commenting should be possible again. I still have to remove some rough edges though.