I. OpenId, OpenId commenting.
This is requested by users. It would allow them to comment using the same OpenID they are using for SE.
II. Support for threaded commenting.
Comment threading makes discussions much more readable. As an example see Dick Lipton's blog. Without threading the discussions in comments will become completely incomprehensible. The checkbox for threaded commenting is already checked but it does not work. I am guessing this has to do with theme but I am not sure.
III. mcrypt module on the blog (for hiding emails addresses with reCHAPTCHA).
When I try to enable the reCHAPTCHA for hiding emails it give an error that the module is missing. This will hide the email address of people in the posts from spam bots by requiring the reader to pass reCHAPTCHA to see email addresses.