I know most of you guys know about this, but I'm sure a lot people don't. Just read this: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=23168 Use this technique combined with filtering out low paying ads. I've seen my adsense clicks go from 6 cents to 50 cents a click. <--of course it varies
I'm sure a lot of people are aware of this, but I doubt that a lot of people use it. It serves as a good reminder. Thanks for this.
Section targeting works for some people, not for others. It's always worth a try. It's a good way to try to get ads that are more relevant to the interests of your visitors, which should increase your CTR, which should increase your income.
This also depends a lot on your niche, some niches the MFAs also pay well, but in some they dont, so testing is the solution