I haven’t had problems with comment span since I installed the Closecomments plugin but a lot of people do have problems and want to keep their comments open. For that reason Sixapart is integrating comment registration in version 3.0 of Movable Type. I was pretty uninterested in it and pretty disapointed it was the solution we had come to because I don’t really want to have to register to comment on someone’s blog.
Seems I’m not the only one because they are also rolling out Typekey as a free registration service that people can use for their own site. That way we can share the registrations and use the same ID on a bunch of blogs. Good solution. It’s yet another service I’ll have to register for though so I hope someone finds a way to aggregate all the “social software” memberships and give me a unique login.