Juxio--multimedia communication (facebook, twitter, email) Lots of potential here for communication--could, for example, send home for updates on class work (digital mulitmedia news letter).
Tools for screencasting. I thought screentoaster was going offline, but perhaps not. Recommend: jing (5 minutes); screencast-o-matic (10 minutes); screenjelly (3 minutes), screenr (for twitter).
Recommendations for back channeling (networking computers for real-time online conversations while presentation/video is happening). Interesting possibilities. Twitter and more.
Audioboo allows you to record podcasts and upload to web; designed for mobile phone, but can be done from PC too. Can embed on website our automatically upload to Twitter or Facebook. Lots of potential.