Clixsense is one of the oldest and largest paid to click websites on the net today. I will tell you I have not upgraded my membership or anything with this website and I earn about 20 cents a day from paid ads. I leave it open and refresh the page every so often while I am doing other things. The ads tend to be on a first come first serve basis. The affilliate program is not the greatest as you only earn when someone in your downline upgrades, but the likilihood of this happening is high.
If you do any paid to click programs make sure this one is on your list.
Clixsense 