Yes. People with Wordpress/Vox, Livejournal, OpenID, and Movable Type accounts can use that account to log in in order to comment. YOU DON'T HAVE TO LOG IN TO READ THE BLOG , THOUGH!
If you don't have any of the above accounts already you can register with Movable Type before posting comments. After going through the registration process, you'll get a verification email. That email will contain log-in instructions with a temporary password. Once logged in, you can change your password to anything you like.
Recently, I required ALL commenters to register because I was getting dozens of SPAM comments per day, all about Viagra, Porn, and cheap drugs online.
I don't know how other blogs avoid the SPAM comments but it seems people are more easily able to comment anonymously.
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