Link to article mentioned in the thread starter:
http://www.boston.com/sports/touchi...st_in_spring_ratings_weei_tied_for_fifth.html
As Chad usually does, he combines the months of April-May-June and issues his findings as "the Spring book" as in the diary days, which is incorrect methodology. Each of the 13 4-week PPM reports per year stand on their own; in fact, each week within the reports start from "zero" - there are no rolling averages or trends. It's not really a gross misuse of the data, just something to consider as you're reading.
Side note: one of these years there will be one PPM month that consists of 5 weeks instead of 4; this to make the monthly titles actually fit within the actual calendar.