I'm reading World War Z, have watched the first installment of "The Walking Dead", and just spent some quality time playing Left 4 Dead. Too much? Am I feeling scared? Paranoid?
Actually the main thing I'm feeling is an obsessive urge to buy a Saiga 12 gauge. I always thought they were kind of neat before, but now they've just got "Zombie Gun" written all over them.
A couple of notes regarding some of those other items: World War Z is pretty interesting so far. The detail and complexity of it is very impressive, and very absorbing. And if you haven't seen "The Walking Dead" yet, get in on it while you can at the beginning. This is easily the best cinematic representation of the zombie apocalype since, well, anything George Romero has ever done.
To make things even more interesting, the zombie mythology, if you will, is very consistent between WWZ and Walking Dead, so you can immerse yourself in the "reality" of each.
Right now, though, I think I'm going to take a break and go watch something a bit more lighthearted.