Show a chart of the ratings per episode for every season/entire series so that you can see if the show getts better/getts worse.
It would be cool so see that the first season of a show is better then the last one. Maybe you saw the last episode aired on your tv, thought is had a reasonably interesting concept, but not good enough to want too keep watching. Then you could see if the first season got different ratings and realize; "Maybe it's worth watching after all!"
I think a graph would give it a better look, and make it easier to understand and read.
Good idea. In the meantime, check out http://trakt.jemu.name