Where can I find a detailed biography on David Letterman?

Factual Questions
1

Not a book, just a URL.

2

A Net search turned up many like
http://www.newyorkshow.com/TV_Shows/Letterman/Biography/davidletterman_biography.html
http://www.intac.com/~fredman/letterman/bio.html
http://justice.loyola.edu/~dsmith/letterman/

3

Not much but it’s a start:

http://www.intac.com/~fredman/letterman/bio.html

4

Where’s Elizabeth Ray when you need her?

5

Biography.com ?