I was referred to Free.cool-traffic.com by a friend, and right off I didn't really like it. The design is really simplistic and gives the whole site a "Here today gone whenever" type feel. Once you sign up it doesn't get any better. It's a simple traffic exchange through and through, but it constantly tells you that unless you upgrade and become a pro member then you may as well not even waste your time and also has a long timer and pretty lax standards for submissions, many of which are now defunct, with a few frame breakers besides. All in all, I've gotta give it a thumbs down.