No HTML Posting - Advise for Usenet, with rationale in some detail.Usenet Primer - Describes the Usenet culture and customs that have developed over time.
Dear Emily Postnews - Using a bit of reverse psychology and sarcasm, Brad Templeton fill users in on the proper way to behave as a participant in newsgroups. Netiquette.
BBS Etiquette - How members of midwives.org conduct themselves on their electronic bulletin boards.
The Bincancel FAQ - An explanation of why one should not post huge binaries to non-binary newsgroups.
Netiquette - A quick overview for those new to Usenet. Not comprehensive, but does answer many of the common questions raised by newcomers.