Thursday and Tuesday are my best days. Traffic/CTR/ePCM all at their best. It's weird how there is a noticable drop on Wednesdays but there is.
my best days are the ones where I make some money usually wednesday and thursday my time and Friday US time (Saturday here) seems to be when I get the most clicks from my US based sites. My Australian based sites are strong through the week but add nothing on the weekends
i also think best days are the ones i actually get some clicks. And those days are usually sunday. I almost double my impressions on sundays (and my impressions raise from saturday to monday). Semms like in sundays people rest and gets in the internet a lot more :s
these 3-4 days have been my good days with adsense ,and not to mention i just started a week ago in DP.