TrafficWave is, again, not quite a traffic exchange. Rather, it’s a valuable tool to use with the traffic you’ve already attained. It’s a fairly sophisticated autoresponder for email lists, with a 30-day trial and a suite of tools designed to help you put together the best autoresponses available. Use it in conjunction with any of your affiliate or referral programs for a sizable benefit.
Monster-Traffic is another traffic exchange, though it’s initially a little off-putting due to the 1995-style website. It’s a free for all styled advertising list, where anyone signing up becomes part of the audience and an advertiser at the same time. You sign up and you can enter a link into their system, and that link is added to a roster that is send out to every member of the group. Additionally, registration allows a free solo ad; an ad that isn’t drowned out by other advertisers in that mailer.