I just discovered this new feature in Google Reader that might be useful to analyze your reading trends. Google Reader now allows you to analyze reading trends of each individual feed you are subscribed to.
To view trends for a particular feed, open your favorite feed in Google Reader and look out for show details link on right side.
Earlier this link showed the number of Google Reader users subscribed to the feed and the average count of total posts per week.
But now it allows you to view detailed graph of your reading trends for last 30 days or for time of the day or by day of the week.
Using these graphs, you can easily find out your reading trends for a particular feed and also you can analyze the posting trend of your favorite blog.