Facebook has just released their new layout to its users today.  Just login to the site and you will be directed to the new layout.  I think they did a good job on the redesign and improved quite a few things over the previous beta versions I have seen in the past.

Facebook seems to be the standard as far as usuability in social networking.  The layout seems to load very quickly and they use AJAX technology effectively.

If you get a minute, it’s worth checking out.