Kudos to Six Apart for addressing the concerns of the community with an excellent FAQ. If only other companies would respond so well to feedback.

From the TypeKey FAQ:

QUOTE

With Movable Type comment registration, we've provided a great deal of options for weblog owners. At release (remember, we're still in Alpha), we plan to provide a detailed user's guide to comment registration and comment management options. But, for now, we want to provide a glimpse of the commenting options.

With Movable Type 3.0 you have options. You can:

  1. Only accept TypeKey-authenticated comments where the commenter sends an email address
  2. Only accept TypeKey-authenticated comments
  3. Accept TypeKey-authenticated and moderated comments
  4. Accept TypeKey-authenticated and regular comments
  5. Accept moderated comments
  6. Accept unmoderated comments
  7. Accept anonymous comments
Currently in Movable Type, 6 and 7 are the only two options. 1 through 5 have been added to create a varying degree of accountability.

While comment registration is not the right answer for every weblog, Movable Type 3.0 and TypeKey provide a flexible system that we feel will work for the majority of Movable Type users."

UNQUOTE