In case anyone is still confused about how exactly to comment on other people’s blogs without it being completely screwed up, here is a [rather roundabout] way that works. As far as I can tell, this is the only way that works.
1. SIGN OUT of your own blog
2. Go back to blogs.elsweb.org and locate the blog you wanted to comment on
3. Leave your comment (you have to provide your name and e-mail address, I believe)
And that’s it :)
(Basically, you can’t be signed in to leave comments on other blogs. Yes, it’s silly, but until it is fixed, this is the only way to leave a comment on someone else’s blog.)