Grokking is new to me--looks like a powerful search possiblities that allows a mindmap of related terminology. You can create a teacher account, specify difficulty level, create graphs and more. Looks very interesting.
Kikutext allows text messaging to students and/or parents. Free, though, of course, there maybe costs associated with service you are using. Might be helpful.
Lots of podcasts via links from Classroom 2.0 that address aspects of Web 2.0 tools. Good resource. Addresses various resources from podcasting to videos to PD.
PaperHelper is aniPad app that allows split screen--search web and take notes on other side ($1.99). This app really makes research online quite easy. Recommend.