Login with Facebook plugin that automatically creates WordPress user

Hi all,

I’m looking for a plugin which does the following.

I know of FBconnect that lets you post comments as your FB profile, but I need one which will create a user in the wordpress database unique then to the facebook account.

So the user never has to register a WP account its created once when they first login with their FB details, and then forever associated with that account when they login again.

I hope people understand me?, I’m finding it hard to search for a plugin which does this.

The reason is:
I’m adding a feature that will contain additional info on the users profile which will be stored in an user associated table on the WP database, People these days don’t want to bother registering for a new site, so it would be great if when they login with FB (or twitter, linkin for that matter) they get their own unique profile, which can then contain this additional info.