Easyhits4u:
Its simple, you surf other websites with two options, 15seconds per surf or 20seconds per surf. If you are unpaid you get 0.5 credit for the 15 second surf and 1 credit for the 20second surf. If you are paid you get the whole 1 credit for 15 seconds. There is also surfing for 30 seconds (1.5 credits) or 40 seconds (2 credits) but you can remove them from your surfing cycle. Once you earn credits you can either convert them to banner impressions, 1 credit gives 15 banner impressions if you are unpaid, 20 if you are. Or you can convert them to site views, you pay 1 credit for 20 seconds, 1.5 for 30 or 2 for 40 seconds. A good advice would be to choose 30/40 seconds since most surfers who are surfing quickly to gain credits choose not to recieve surfs with more than 20 seconds. You also recieve 0.3$ per 1000 sites surfed. Yes that sounds alot but if you make 100~200 surfs per day you get alot. You can surf while you chat or play an online text based game or at work. The money you gain from surfing isn't good for checking out (minimum checkout is 3$), however an option i liked is you can convert those $ either to credits or to prenium days. Here is what i can do:
They also have daily drawings for 500 credits, and if you donate you get a ticket per 1000 credits bought for a weekly raffle for 2000 credits. They also give guaranteed prizes:

As for contests, they give good prizes, example they had a contest in october where you get 5k banner impressions,3$ and 5 prenium days. Top 10 got double.
Their prices are:
As for their prenium days prices:

There is also a referal system where you get a bonus when people you refered surf:
They also provide you with attractive flash banners and text adds for you to use. Also using their geo system you can choose which part of the world you want to see your add. Example if you are running an american only service, you wouldn't want people from asia to see it, that way you would not waste views on people who won't benefit you.

Seem like good deals, if you consider signing up at this service please consider refering me =), my username their is khalilov.
Easyhits4u <--- refering me
Easyhits4u <--- not refering me

Smily traffic:
Another good service is Smily traffic, Smilytraffic. Even though i don't use this service anymore its an ok service. The good thing about it is that it gives free stuff for you on signup. Those things are:

So just sign up and surf 50 pages and try them out. I didn't like it because the manual and auto surf don't last long. However the banner and text links lasted about 24 hours. But i only got 1 click form them both, 1/4000 ratio isn't that good. But you can convert 1 manual surf credit to 60 banner/text impressions and 1 auot surf credit to 0.1 banner/text impression. The reason auto surfs aren't worth anything is because, well most people put auto surf on and go to work or something, so basicly they aren't worth anything.
They have good contests too:
However their prices seem expensive:

Thats an example, 3.49$ for 1000 views, srsly...
Anyways its an ok service.
Mybanners:
If you don't have time to surf and don't mind having an add on your website, you can use banner exchange services. Its simple, you put a banner on your website and subimt a banner for your website. Your banner is shown on other sites as much as banners are shown on your website. Example, your page is viewed 1000 times, you get 1000 views on other sites. Normally i avoid such services because there are some people who paste the code 50+times on the same page and keep refreshing it to gain alot of views. Even if the service is very dedicated and trying to be legit , many times it would be too late. I know because i did it once.
mybanners
bannersurge
free-banners
superbanners
impressionz
showyoursite
5000banners
These are some links to banner exchange sites.