Amanda Marcotte resigns
Option 1: This should be taken at face value. Knowing that you might be a liability should you ever make one snarky joke would really suck the life out of blogging pretty quickly, I think. You want to go out on your own terms, but it's clear that this fight is going to hurt you. I think this is still the most likely option.
Option 2: This was The Plan. Edwards's strategists got together and decided they couldn't go out without a show of strength to the netroots, an then asked for a resignation a few days later. I'm skeptical of this one, not least because I don't think Amanda would agree to it.
Option 3: Edwards changed his mind. After sticking with her early, he bailed and asked for a resignation when he saw the right didn't go away. Ick, but I think it's still a possibility, though I like John Edwards and would hope not.
Option 4: ???