EasyHits4U.com is easily the #1 Traffic exchange out there for getting free or paid traffic to your offers/ website.
EasyHits4U.com - Your Free Traffic Exchange - 1:1 Exchange Ratio, 5-Tier Referral Program. FREE Advertising!
HitLink is a close #2 with the added bonus of a social exchange.
A good 2nd option to attract website traffic in various ways.
Tezak Traffic Power with 100k member base is #3 in my list of Traffic Exchanges