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If I generate an average of 13 blocks a month at the current difficulty, BTC 650, that puts my cost at about US$0.005/BTC.
In short, I'm better off buying BTC from the exchange than generating them on this particular machine. Food for thought.
I like the graph too. I have been wondering just how much our processors use and this looks like the closest estimate.
Also, I am a bit confused. Last I checked the market rate was about $0.08 so it would be a lot cheaper to generate your own than buy them even now with an increased difficulty at $0.02/BTC it is still 4 times cheaper than the exchange.
I am going to have to recheck my numbers because I thought I was spending about $0.072 to generate mine.
Thanks,