I have 3 blocks of adsense on my pages and it seems that one of them hardly gets any clicks and the others are shared fairly equally. I have therefore revamped 6 of the pages in question to see if this improves adsense income.
My advice for today is :-
Never sit back and count your money, check out whats working, whats not working and get every last dime out of your traffic without being too agressive.
I will let you know if I see an improvement in my adsense income.