Ok, I did not do anything..:-)
Typepad added support for Goggle's nofollow tag and hopefully that will rid me of any comment spammers. As of now any URL given in the comment posting form, automatically gets a nofollow.
I am not sure if URLs posted inside a comment's body get a nofollow too. I sure would like that to happen, or spammers are just gonna move their URLs into being part of the post itself (I dont have a problem as my blog doesnt support HTML comment;-)).