While the current SciFi viewers stick to a few genres (Technology gone bad, Zombies and such, Space ships, etc), I love the post apocalyptic stuff. Unfortunately, there hasn't been a lot of features or TV shows in the past 5-10 years focusing on this science fiction genre. And, when it has (e.g. Jericho) I lose quick interest in it.
Let me focus in on one sub-genre: a percentage of the human population is gone due to something. That something could mean a virus, a bomb, an alien invasion, or whatever else could wipe out a percentage of human population. Something I have found out is that in the late 70s, British television was filled with programs along these lines. Shows like The Tripods, Survivors and The Changes, and The Day of the Triffids were actively being watched. The last televsion show aired in the US that I really enjoyed was Jeremiah.
Now I am an a quest for older post-apocalyptic British television programs. :)