I am a bit new to WordPress but got an install going and like it a lot. I have it set so that people don't need to be logged in to comment, so when they click on the link to leave a comment, there is a form that asks for their Name, url of site, etc. I was wondering if there is any way to put something in this form that would let them login with their Facebook account, OpenID, Blogger account, etc. I have been using a friend's blog on Typepad lately and it has this option. It makes it so nice because then you see the users picture, they don't have to register at yet another site, etc, etc.
Does this exist in WordPress? Is there a plugin that can help me do this?