The buggy software is better now, but some people are still completely unable to comment — and the primary complaint I’m getting is that the confirmation email needed to register never arrives. One possibility is that somehow, your domain or name or something is blocked by some systemwide filter.
If that’s your problem, send me a note using the same email address you used to register. I’ll forward those to the people in charge so they can dig through the system and discover why ScienceBlogs hates you. Then we’ll slap it silly and tell it to love you instead.