List Members FAQ

Guides to Writing Email

Even tho it's a bit long, this is a very good guide for anyone new to email or to mailing lists, A Beginner's Guide to Effective Email. You can skip to the parts you're interested in with the menu on the left.

And this one is good too, Mailing and Posting Etiquette, it's shorter but it covers the important points, there's also some links at the end to other sites.