Who?
Anybody can use it, so long as they have Microsoft Excel or OpenOffice Calc (or another program that can open files in those formats)!
It was created by myself (my NaNo username is "salzke") for any NaNoer who finds it useful.

What?
A spreadsheet designed for use throughout NaNoWriMo.

Where?
Head over to the 'Downloads' page for the latest version.

When?
During November, of course, when you're writing 50 000 words.

Why? .
I was inspired by Atalanta's spreadsheet in 2007 and decided to "roll my own" in 2008. This year, it remains basically the same but dates have been updated and a few minor changes have been made.