The following is an ad request chart of my iPhone app, Men vs Chimps Lite, for the first three weeks since its first release. Do you find anything interesting? Notice that today, 9/27/2009, is a Sunday.
Although the data is limited, I found that Wednesday, Thursday and Friday usually have peak usages. I have thought people may use iPhone apps more often on weekends. Obviously, I was dead wrong! From the chart, Saturday has the lightest app usages.
Perhaps, people are having fun on the weekend and they don't need iPhone apps. Everyone works hard on Monday and Tuesday. By Wednesday, iPhone users are already looking for weekends and use (entertainment) apps to kill time.