I think mobile technology has great potential in the classroom Here are some ideas for texting in the classroom and the blog addresses issues with texting as well. (7/12/12).
Good blog on what teachers should be able to to with mobile learning for 21st Century learners. Has sensible links too to social bookmarking, audio and more.
VocabGrabber is word cloud resource that allow you to enter text and then it automatically generates a thesaurus of word meanings. Looks interesting for helping students with difficult vocabulary.
You can set up online meetings with Ohours--open office hours. I see lots of potential here for online meetings.
You can also meet other people, which doesn't seem to me to be terribly helpful...whatever.