Go to http://www.teachers.tv/ and register - there are many great videos illustrating many aspects of teaching and learning. Video 37336, for example, gives examples of students and a teacher using twitter. Sorry I can't put this link onto this blog - but it's easy to register.
Also go to the new LL ICT site for ideas and examples: http://learning-languages-with-icts.tki.org.nz/
Don't forget our own stunning page on our wiki: http://e-languageexemplars.wikispaces.com/