How much have you earned so far from Google Adsense?

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I keep reading about opportunities of earning through Google Adsense. The other day I read about someone who got paid through Adsense . Their minimum payout being 100 dollars, that is a huge amount to earn even in a year. My own blog is affiliate to adsense and the earning is at best a few cents a month. The maximum I have earned so far in a month is 2.34 dollars a month. So one can imagine how many years I am going to take to make it to the minimum payout amount.. Friends just out of curiosity I would like to know if any of you are earning decently well from Google adsense? If so, what is the secret? can you plz share it here with all of us?