A great site I use to keep organized with my tv is this one (http://www.pogdesign.co.uk/cat/). I don't know what I'd do without it! But having it all on a calendar format with the airtimes/ep name/number really helps. And you can "check off" or mark it when you've seen it, so you don't have to worry about wondering if you missed an episode. :)

I've used the site to make this list, actually and lately they've added a lot of british shows as well.

Ah, yes! They do keep up to date with it, I think. Also with the British shows. Which is nice. Downton Abbey just got added on today! Perfect timing, too. You can even suggest shows! They grab their info from epguides.com so if the stuff isn't there you can request that get add certain ones if you give the info from tvrage.com. Ha. So I've done that before. Notified epguides of a show missing I wanted on there. Then the calendar site got it on their calendar. Muhahaha.