Here is a great podcast by Tom Ashbrook , posted at On Point .  It is called The World According to Twitter .  Description from their webiste:

"Once there was slow talk and silence. Then came letters - delivered by horse or sailing ship, months in coming, deep in thought. Then came the telegraph, telephone, cell-phone, e-mail, Palm Pilot, Blackberry, texting, instant messaging, and now -- Twitter.

Non-stop, instant communication from anywhere, all the time. Hyper-connectivity, always present, in a non-stop global mind-share of twittering micro-thoughts. "Hungry!" "Love duck." "Doing dishes." "Off to bed."

We're pushing deeper into the seamless cyber-mind. Are we happy now?

This hour On Point: Twitter, and the hyper-connected culture.

Guests
· Jack Dorsey, co-founder, Twitter.com
· Rob Pegoraro, personal technology columnist, The Washington Post
· Holly Willis, professor of media studies at the University of Southern California and editor of the forthcoming book, "The New Ecology of Things"
· Robert Scoble, former Microsoft blogger, now vice president for media development at Podtech.net ."

One complaint.  Only available for windows and Real player.  :(  Who the heck even uses real player anymore.  Why make Mac users jump through hoops to listen to a podcast.  What is wrong with good old mp3 or quicktime so everyone can listen?