The best option is to have a good Internet connection, that will allow us to access our favorite series whenever we want and without adverts. But, keeping track of everything that we are watching: how long a season is, the episodes that we have already seen, the episodes that are going to be available soon,... , can become a very difficult task, specially when we are fans of multiple TV series.
To do so, we have Airs (Automatic Series Monitor), a lightweight application that we can use to maintain all the TV series that we are following well organized. To do so, we only have to add the title of each one of the series that we follow and resort to websites like epguides.com or tv.com, that will maintain us up to date of the new episodes or they will even help us to download the episodes that are available.
With Airs, you no longer have any excuse not to have your favorite TV series up to date and organize them.