I have far too much fun with Google Adsense.
I began putting ads on certain sections of my sites in the end of January, here are the monthly statistics of monies:
February: $24.05
March: $12.51
April: $20.42
May: $32.64
June: $22.33
July: $21.11
August: $23.69
September: $27.30
So far this month: $40.73