Take a look at tvQ - it's a great app for tracking your favourite tv shows, keeping on top of what episodes you've watched, and notifying you when new episodes are coming out.
It's available at: http://itunes.apple.com/au/app/tvq/id498440476?mt=8
Take a look and give us your feedback here, or on Facebook:
https://www.facebook.com/tvQapp
Thanks,
Rob
(One of the devs at M2D2).