There are several clever names for helpful guides that assist with understanding the etiquette (Twitterquette) and lanquage (Twictionary) of Twitter. However, I found a blog post I really, really like who broke it down for me.
http://www.brentozar.com/archive/2008/08/twitter-101/
I found Brent's post when I was tying to find out what "RT" meant. (see blog post "Facebook Updates have thier own language").
As he says in his profile that he has been using Twitter for at least two years and from what I can tell has not just a good grasp of the pros and cons of Twittering but also breaks it down for us Twitter virgins. (or persons like myself who get Twitter updates on friends via Facebook and have NO IDEA what they are saying...)
