You might want to follow this "challenge" as a sideline to the class!  Let's see what sorts of things they work through.

a variety of ways to use Twitter and the results from using it in his class

Wow, knighthood!

A good discussion of alternatives to "friending" your students - lists, pages, groups, and what the differences are.

This is a search I did, but you could use it for finding other topics you are interested - and the people who tweet about them.

YouTube video on using the "direct message" feature on Twitter.

He says he will help you make the most of Twitter by using an application called TweetDeck.  He explains how to use TweetDeck in this video tutorial, part 1.  Link to Part 2 included.

Twitter has become a powerful tool for community organizers, marketers, and others who want to share and receive information in a fast, friendly environment. It's no wonder, then, that teachers have also found success on Twitter, using the tool to connect with students, share information with parents, and find useful resources. Here, we'll take a look at 100 tools that can help twittering teachers make the most out of this helpful microblogging tool.

LOTS of information here about Twitter - answers questions about retweeting, hashtags, chats, and much, much more.

Backchannel communication is a secondary electronic conversation that takes place at the same time as a conference session, lecture, or instructor-led learning activity. On an informal basis, this might involve students using a chat tool or Twitter to discuss a lecture as it is happening

An English teacher in Iowa talks about how she parlayed Twitter interactions into a class trip halfway around the world.

This is the story - as seen through Twitter - of how a man tracked his stolen laptop and how his friends helped him find it.

Downloadable educator's guide by Linda Fogg Phillips, written at Facebook's request.  The homepage says:   "Our commitment to you is to provide an easy way to stay updated as changes occur with Facebook.  We created this website to do just that, in addition to providing you with even more insights, guidance, and resources." but that still doesn't tell me much about what's in the guide...

I don't have an iPad or a WordPress blog, but this looks like a lot of fun! I wonder if it would work with an iPod Touch or iPhone? Android phone?

What's a "tweet-up"? what's a "twitterwall"? Ideas for using Twitter at group meetings.

Have you ever read an NMC Horizon Report and thought, "I want to start implementing these technologies and learning approaches at my school...but where to begin?" Produced by the New Media Consortium (NMC), the Report details emerging technologies likely to have a significant impact on teaching and learning around the globe. The Toolkit is geared toward education leaders who wish to learn more about and further the dialogue on the emerging technologies identified in the Report and their potential to re-imagine K-12 education.

Little is known about the population of educators who teach online, especially with relationship to preparation from their teacher education programs. This article discusses the results of a national survey of K-12 online teachers from across the nation to ascertain how prepared they felt they were with regard to three key areas: technology, pedagogy, and content, including combinations of these domains, as described by the technological pedagogical content knowledge framework (Mishra & Koehler, 2006). Overall, K-12 online teachers indicated that they felt the most prepared in the areas of pedagogy, content, and pedagogical content. They felt least prepared in the areas of technology, including technological pedagogical knowledge, technological content knowledge, and technological pedagogical content knowledge. Implications for the field of teacher education are discussed, including the need to more fully integrate technology within the coursework and field experiences of teacher candidates, and the need to create courses, or specific modules within existing courses, to address topics of importance to virtual teaching.