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Now our weekend CPC is higher than weekdays and earnings almost on par though traffic is lower. I notice that stats of prior days hardly change (if any) after the close of each day.
Perhaps Google now reconciles/adjusts stats over the weekend rather updating each day, making the weekend look more active than it really is. Just speculation.
I do find it interesting that the difference between traffic on Mondays and Tuesdays (normally my busiest days) and on weekends is no longer as extreme as it once was. I don't know why this is true, but I wonder if it's the result of more people having broadband. When people have high-speed 24x7 connections at home, they may be more inclined to research trips with their own PCs and not just at work.
Just a guess anyways... but my sites also get less traffic on the weekend but have higher CPM.