Apparently the buzz around the top blogs is that if you post prior to 7AM US EST you realize an increase in traffic in the neighborhood of 10 to 20% for that post. I've been using timestamp so I can do that, since my brain is too mushy to write that early in the day.
Mentioned here during last week's Open Mic:
www.successful-blog.com/1/the-mic-is-on-are-we-stat-crazy-or-analytical/