[off-topic, nitpick] To anyone who plans on writing a blog post with graphs: please differentiate data sets with actual colors as opposed to closely related shades of blue.
I was just saying the same thing in the "IE is dying" thread. I suspect "shades of blue" is the default setting in whatever graph program everyone is using these days.
Units on the horizontal axis would be great too. Really, these graphs don't mean a whole lot without units.