A good friend of mine who is no longer in the classroom (but absolutely SHOULD BE!!) sent me this article the other day as she was researching stuff for her new job as an educational consultant.
The article identifies how teachers can use Twitter for professional development and networking, like we've been doing in class. It gives a little bit more instruction as to how to go about finding networks of people with similar interests. And, it offers a degree of validity to the whole tweeting process.
And, if you're interested: I've been posting links to interesting tools in the sidebar over <--, so check those out too, if you'd like!