I thought I'd share something.
A while back, a friend of mine created a website where one can:
There are a lot of functionalities that are awesome.
For instance, I now know that I've spent "2 Weeks, 5 Days, 15 Minutes" watching all the episodes I submitted to the website.
It's really handy, whether you follow just one show or, like myself, are watching 16 of them at the same time.
He's constantly developing new features (but not cluttering the interface), which is also good. For instance, apart from having an RSS feed of the new airings of shows you're following, it seems that pretty soon you'll be able to subscribe a calendar with that very same information.
Anyway, enjoy: MyTVShows.