Just like they did with RSS, the folks over at Common Craft do a most excellent job of explaining twittter in plain english.

Seems like in the past month or so twitter is moving beyond a “what are my friends doing microblog” to something else.  What that something else is seems less useful to me. It feels I am currently using twitter a lot less then I was a month or two ago.  My TweetStats seem to back that feeling up.