Its not always a bad idea to look for specific low paying ads because some niches that pay very low have very low competition.
Maybe check my site http://show-pics.blogspot.com/ With Google preview tool, and looking for ads that cost about 0.01$ I usually got
adster.com has some real good ones for no more then 26 bucks for the day and with the right ad you can hit 2000hits easy...i have done it. but the ad has to sound good. i tried wording my ad different and my hits went from 1500 to 750...i modified it agian similar to the first and i came back to 1700 just like that.
I have a myspace template site, it pays less than 1 cent a click most of the time (eg. 10 clicks, earned me 7c)