monitor adsense

Just been using the tool from http://www.asrep.com for quite a while now, and it is really a good tool.

You get all sort of stats about who has clicked on which ad, where they come from, etc ...

If you cross analyse the data provided, you can then identify how much you make out of each page! All you need to do then is to adjust your landing page in adwords or overture (or other PPC provider) to lead your propects to the right page.

I have been doing that on 1 testing site. the $50 were paid back in 3 days (monetisation has been multiplied by a factor 4!). Worth the investment.