I keep a list of series I've seen and liked on Trakt.
I have a Watchlist of shows I want to watch together with a list of shows I am watching now or watching next. I also share thoughts on some series I saw.
SickChill - Automatic Video Library Manager for TV Shows. It watches for new episodes of your favorite shows, and when they are posted it does its magic.
Catch - Mac application that runs in the menu bar, and will automatically download episodes found in your ShowRSS feed using your favorite BitTorrent client.
Medusa - Automatic Video Library Manager for TV Shows. It watches for new episodes of your favorite shows, and when they are posted it does its magic.
Subify - Tool to download subtitles for your favorite TV shows and movies.
FlixPatrol - TOP 10 on Streaming in the World Today.