Only a few are worth watching again: Morse, AbFab, and the immortal Fawlty Towers. Otherwise, I try to catch episodes of South Park, New Tricks, and HIGNFY as they appear online, and I'm hoping for more seasons of Luther and Doc Martin. In the past, I've enjoyed Waking the Dead/Body Farm, spooks, and a few other UK dramas. As for actual TV, I only watch Mystery, science, and nature shows on PBS. Downton Abyss does nothing for me, I'm afraid. The less said about American network fare, the better--AFV is as good as it gets.
milliHelen: amount of beauty required to launch one ship.