The programs I use are TrafficSwarm, which is the best program I've used by far. You simply surf sites to earn credits, which turn into visits. The ratio is EXCELLENT compared to most other programs. Each site you visit while surfing on TrafficSwarm will earn you anywhere between 1 and 5 credits EACH, and since there is no limit to the surfing each day, you can get quite a bit. Also, the referral program is excellent! There are 5 levels to your downline, and each time a member of your downline clicks an ad, you get 1 credit. I have 11 referrals and I get an average of 100-200 credits daily without even surfing.
Another important Traffic bringer is InstantBuzz. InstantBuzz works as a toolbar rather than surfing other pages. You earn credits for each banner displayed on the toolbar, which changes from each page you go to, so you can get quite a few! You set up your own ad to display on other InstantBuzzers and can get a significant amount of traffic as long as you keep the bar running, which isn't hard to do since it's automatic for both Internet Explorer and FireFox.
The third program I use is another toolbar, simply titled the Free Traffic Bar. Again, this works exactly the same way as InstantBuzz with the exception that the ratio is 4:1 for a credit, and that the ads rotate themselves, it's not dependent on you surfing to different pages or not.
TrafficRoundup is another great surfing-for-credits traffic exchange. With a 1:1 ratio, you can't beat it, this way you KNOW that you're getting 1 visit for each visit you give to someone else! This works just like TrafficSwarm in the sense that you click to surf the next site and you earn credits instantly.
Finally, to complete the myriad of free traffic programs is 10kHits4U. This program is pretty cool, it has a 10 second countdown timer, which is nice and short (same as TrafficRoundup), except you earn 0.5 credits per visit, so you earn half as many credits as you do with TrafficRoundup, but in the end, any traffic is good traffic, so why not add another one to your list.
Using all of these programs together, I've managed to accumulate a fairly constant number of daily visitors ranging from 25-35, and hopefully it will keep rising with the number of credits I have and how much content I add to my site. Again, while these traffic systems do work, you still need to stick to the basics in order to keep your traffic coming. Nothing will ever beat out good content and constant updates, if you keep your readers updated and enticed with new, high quality content, you're guaranteed to get some more traffic by word of mouth.
I hope you can put some of these programs to work and start earning yourself some traffic, and maybe you could be like me and earn some AdSense money!