I was recently doing some work related research on ARM linux, and while visiting the ARM linux website I noticed their excellent mailing list etiquette guidelines.

Of particular note, the well formed anti-top-posting signature:

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

Of course, now is a fantastic time to get reacquainted with RFC 1855, as you already know, it’s all about netiquette and internet communications.

Abstract

This document provides a minimum set of guidelines for Network
Etiquette (Netiquette) which organizations may take and adapt for
their own use. As such, it is deliberately written in a bulleted
format to make adaptation easier and to make any particular item easy
(or easier) to find. It also functions as a minimum set of
guidelines for individuals, both users and administrators. This memo
is the product of the Responsible Use of the Network (RUN) Working
Group of the IETF.