Traffic exchange

I personally use two traffic exchanges: Easyhits4U and Deepspacetraffic. The first one gives you cash too, so I find it a really nice way to both promote my sites and earn money. The second one only gives you credits but it's a lot of fun to use, since it treats surfing kinda like a space battle game :) My experience with those sites is good in general, I've gotten a few referrals coming from there, but unfortunately most of them weren't really active... but well, that's not the sites' fault :)

I use TRAFFICBOOM. An italian site and it's very good! If you understand a bit of italian you can try it!

well i have a website that is in my profile, some of the sites listed there will let you earn and surf at the same time and they are paying.