I’m just chiming in to say that I’m very much for e-mail verification for comments. Forcing people to create a login discourages them to just jump in and join the conversation. But, if they could fire off their comment, then later click the link that shows up in their e-mail, then you get their participation with as little labor as possible on their part.
I found the trac ticket that addresses this issue: http://trac.wordpress.org/ticket/5034.
And, it shows plain n’ clear that somebody will get around to it in 2.4.
So, I guess that’s that. I’m a bit disappointed that this isn’t being given more prompt attention, but understand that it’s one issue within a very large project.