The Seven Don'ts of Usenet
Gives a list of behaviours to be avoided when posting to Usenet groups, as well as links to expand on each item.
http://www.cs.tut.fi/~jkorpela/usenet/dont.html

Rules for Posting to Usenet
Offers an discussion of what, and how, to post to newsgroups.
http://www.faqs.org/faqs/usenet/posting-rules/part1/

How do I quote correctly in Usenet?
About attribution, quoting, answering, quotation marks and quoting other resources.
http://www.netmeister.org/news/learn2quote.html

The Bincancel FAQ
Explains why one should not post huge binaries to non-binary newsgroups.
http://www.geniac.net/bincancel/

Why is Bottom-posting better than Top-posting?
Short lesson by A. Smit and H.W. de Haan explaining how threaded conversations such as found on Usenet are adversely affected by those who "top post" instead of "bottom post" their replies.
http://www.caliburn.nl/topposting.html

How Not to Look Like an Idiot on Usenet
A list of 16 rules for basic Usenet postings is provided.
http://infohost.nmt.edu/tcc/help/news/idiot.html

Why Ask Questions in Public?
Briefly explains advantages of asking technical questions in public rather than e-mailing them directly to a group member. Written and placed in the public domain by Russ Allbery.
http://www.eyrie.org/~eagle/faqs/questions.html

Internet Trolls
People who delight in upsetting other Internet users are known as 'trolls'. This article examines the phenomenon.
http://www.hyphenologist.co.uk/killfile/antitrollfaqhtm.htm

Dear Emily Postnews
Satirical questions and answers on how to act on Usenet.
http://www.templetons.com/brad/emily.html