send emails to everyone in a spreadsheet | Google Docs Scripts

A tutorial for using scripts to send emails from Google spreadsheets.

What's missing:
I'd like to be able to include column headers
I'd like to send one at a time

• Tutorial: Sending emails from a Spreadsheet

• another helpful script 

This might actually be what I'm looking for:

• Simple Mail Merge

As soon as I have some real time to play with it, I'll see what I can do to make more accessible.