BIB - I would LOVE to see the TWD team take a look at that, perhaps as a flashback episode/webisode or something. The Walkers are terrifying enough to those now used to them - imagine their impact in the early days!
It was ruled out, But you never know now with a different show runner things might change.
Also i wish they'd stuck to the idea of having a stand alone episode at the beginning of each season.
It was originally planned to have at start of season 2 that guy who'd shot himself in the tank that Rick climbed into in the first episode. He was going to have an episode about how he got there etc.
Shame it never happened.