Essentials For Twitter

I'm often asked (believe me--I'm often asked) "What is Twitter? Why do you Twitter?" I've pointed to several spots on the web that intro you to Twitter, but this site I found yesterday seemed to be the most comprehensive guide to Twitter that I've found.

Be prepared- it's a long post but one worth the read.

What other resources about Twitter could you share with me as I Twitterize my community?