Interesting how earnings are getting better. With my current equipment, I had a low moving 7 day average of 0.057 BTC per day back on 6/28, and it crept steadily back up to .079 BTC per day yesterday. Just luck? That is a steady earnings increase on the same mining rigs through 2 LOD increases. Very interesting!
So the difficulty decreases sometimes? I was under the impression that it only went up-and-up-and-up.
How is the difficulty set? Is it set by the number of leading '0's required for a block solution? Who sets the difficulty? Is it the nodes?