This graph probably isn't very surprising. It shows that Mac has become more popular in the last year. Some detail on the last four weeks:
Another view on the same detail. The exact underlying numbers involved:
Like I said at the beginning, generally the breakdown of the operating systems in general. Even so, the eight or nine percent of users on Mac or Linux make up nearly a quarter of a million users.
Like before, the numbers and charts are visible on Google Docs. No script this time, the work was easy enough to do by hand.