Here are some of the email's former-FEMA directory Michael Brown sent during the crisis. I'm still reading. Congressioanl analysis about the email is here. To sum it up, Brown was full of crap at his appearence before Congress. He was not a good leader and utterly failed to response to the worsening conditions or act on opinions that fell into his lap.

Tom, Nick: Can we load the email senders/recipients into that social network mapping code you guys have to see who communicated with who and how strong the ties are. It could be cool to see if we can determine who picked up the slack and was making all the decisions. At the very least we can see who knew when and what they did about it.

Brown's emails during Katrina (PDF)