"Netiquette" is the newly developed term for online etiquette. According to Wikipedia, it " is a catch-all term for the conventions of politeness and respect recognized on Usenet, in mailing lists, in live chat systems, and on other electronic forums such as Internet message boards."
This concept is an important one to teach our students...especially if we have them blogging or emailing as a part of our classroom instruction. I have created a Powerpoint that teachers can share with their students.
Download Netiquette.ppt
There is an excellent website that has information on Netiquette as well as an online quiz that you or your students can complete. http://www.albion.com/netiquette/
Additionally, Virginia Shea's book, Netiquette, is the definitive source on this topic.