OpenID user sign ups by provider by week
Umm... wow. That's a huge amount of growth in new users signing up via alternative providers!
A lot of this growth probably has to do with the log in page itself. TypePad has been continually redesigning their log in page as well as the blog comment form to encourage people to use OpenID and specifically Facebook and Twitter. Whatever the cause, it appears that users are increasingly using alternative authentication to register for TypePad and are choosing Facebook above other services.