EasyHits4U

1:1 ratio for 20 sec surf, possible to surf 2:1 for 15 secs. 30 cents for every 1000 pages surfed, an automatic 10 cents per referral, cashout at $3. The most user-definable traffic exchange around, you can decide what days your page is shown on, limit how many times it is showed that day and lots more. Huge membership, high class, slightly dull, no bonuses or add-ons.
Em-Hits

20 second timer, fantastic 1:1 ratio. You can rate pages as you surf them, and of course get feedback in return. Lots of bonuses, credits are exchangeable for cash as well as traffic. Four referral levels, fun one armed bandit game, its a relatively small site but its set to grow.
Shareadspace
As much about cash as it is about traffic, but good for getting either. Large membership, play trade or no trade or the match game as you surf for bonus credits.
MythologySurf

3:1 ratio, 8 second timer, good game while you surf, some cash bonuses, growing membership because of how heavily it is being promoted. Overall, a very good site.
HitTactic

2:1 ratio, limit other people to viewing your page once per day if you wish. Earn $0.025 per 100 pages visited and $0.10 per referral. Bonus credits can be won by playing no-risk poker.
SeaFastTraffic
Superb 2:1 ratio and hundreds of free credits for signing up and activating your account. Fifteen cents to begin with and a cash prize for surfing between 15 and 100 pages everyday.
RoyalSurf

Play the quest game as you surf, earn very frequent bonus credits, impressions and cash as you surf. Ratio starts at 3:1, but improves the more you surf during any given week. This is an excellent site with a very large membership.
Share-Traffic

HitBandit

TrafficMeet

TopSurfer

Pay4Surf

SmileyTraffic
FreeTrafficWorld
A fantastic site that gives away a weekly prize pool (given randomly to surfers) that increases by $300 every week. A 2:1 ratio, loads of bonuses and 10,000+ members. Cash prizes seem ti increase in value and frequency as the week draws to a close, as they need to give away the cash prize by 12pm on sunday.
NewWaySurf

SurfForMoney

HogsHollow

TipTopTraffic