Google Adsense help has issued a notice explaining how to view the data accurately, as the dta display has a glitch in it which google are trying to fix.
You must look at earnings from all time, not 'last 3 months' in order to view the data accurately
here is the full explanation;
http://www.google.com/support/forum/p/AdSense/thread?tid=5f1686088c248071&hl=en
Google Adsense has oroved to be the only affiliate marketing solutuin with which i ever made a cent, so if you have a websie and are looking for a way to monetize it, i recommend using your free space for adsense ads instead of all the opther afilliate marketing sites, for they never pay. Adsense pays per impression too not only per click or sale!
Useful Iterature;
