Twitter is most often dismissed as a low-rent and featureless Facebook status message. Sure there is a lot of that but it is much more than that now. It is conversation. It is open conversation, like yelling from a roof top, with the ability to make sure that folks who share the same interest in the topic that you do, see your message.
This power is called a Hash Tag. A hash tag is nothing more than a # followed by a key word or phrase. ISTE '11's Hash Tag was #iste11 and any post with that tag would be sure to be seen by those following that tag. For the NEA conference in Chicago this week the tag was #neara11 and attendees Tweeted about discussions they had attended and who was eating where to name but two.
There is a point to this.
You could use Twitter in your classroom to further discussion outside the classroom in a manner and on an electronic device that most of your students from 6th grade on have in their pockets, their cell phones.
Might be an interesting experiment this coming year.