The easiest way to earn on the web is to autosurf, you open your browser and let it do all the work for you, simple.  You get cash for your efforts, and credits to advertise your own web sites for free.  I've listed my sites below.  Remember a lot of these sites will give you a head start so you can start earning straight away, but it may take 3 months before you can cashout.  So if you can afford it upgrade a little and start getting a return as soon as you can, a little in each is the safest option, don't put all your money in one place.  You should also get some security and pop-up blocking, see my resources page for more info on this.

StudioTraffic