Clif Mims in Mahmphis plurked a sweet little application a while ago. True to the micro-blog creed, it's a short one: Useful Microblog-like platform for classrooms and presentations . I'll be using this lean little backchat tool, called "Today'sMeet," perhaps with my 4th graders tomorrow, the last full day of classes b4 winter holidays :)
Sign up for Plurk here! You'll love it! It's Twitter with discussion threads!
Here's a screen grab from my plurk interface. Click for a larger version!