Your Reader Trends
Google Reader has an useful feature which shows not only reader's trends but their reading trends/progress.
I agree with this, although Google Reader trends was very limited. For instance If you had you feeds to show as full items and mark as read on scroll past it counted that as you actually reading an item in trends. It also only allowed you to see the top hitters in your feed list.
For me it would be better if I could see the feeds I pay no or little attention to (so tracking how many articles I actually click the link, share, send to pocket or star) so that I can periodically remove the feeds that are cluttering up my news feed.
Currently with Google Reader the only way to do this is to use a kind of folder based league which is cumbersome and time consuming.
Just a thought
I love the charts showing days of the week and times of the day. This page also provides bragging rights for serious google readers. Would be neat if they integrated global stats as well- showing how you rank.
Similar to last.fm, it would be cool if the site could match you with a "virtual neighborhood" of users with similar tastes. A great way to push content discovery as well as a better social experience.