I have added a page of basic Twitter terms and terminology here at the Happy Accident. You can click that link or find it in the navigation menu up above as Basic Twitter Terms.
The page started out on the Book Promotion on the Web wiki, a project begun for a breakout session I did at the Computers Freedom and Privacy conference in 2008. There is other Twitter information there, as well. Feel free to update the wiki or let me know if there are other terms you think should be on the list.
