It's pretty evenly spread for me except for Saturday, which is always bad. I think it depends on the niche.
Yup, Tuesdays and Wednesdays do good here too. But I think it depends a lot on where and how the visitors come.
I suppose it all really depends on your niche and when visitors are likely to visit your site. My myspace resource site has had consistent revenue week-long, where as my arcade site will see better earnings on the weekend.
It probably has something to do with bored surfing at work. At least on my site, the traffic is up midweek, but they also leave sooner and are more likely to click ads. On weekends, I get fewer visits, but of longer duration, and ad income goes down.
Yup, Agree, Tuesdays and Wednesdays do good here too. Because the traffic is higher than usual, I do not like the weekend
Weekdays are best in my niche (entertainment), while on weekends traffic and earnings are much lower.