What is good click thru rating? I'm currently getting 3.45% CTR, is this good? My earnings per click seem very low. Can anyone suggest strategies for increasing it? I already heard that having too many ad blocks per page reduces the earnings per click.
I think anything above 10% is good. http://www.45n5.com/permalink/how-to-split-test-your-adsense-for-higher-earnings.html
It depends on the type of website too... websites like joke sites will tend to have lower average CTR than sites with targetted content.
that link is at my blog split testing is cool because there is no guesswork, your visitors tell you what colors/ layouts they like to click most on. likewise they also tell you what doesn't work.