"Socrative is a smart student response system that empowers teachers to engage their classrooms through a series of educational exercises and games via smartphones, laptops, and tablets."
"This site is designed to promote the networking and integration of Mobile Learning into classrooms around the world. On this site you will find several resources that will help you to find answers to your questions:"
A service of drop.io designed for recording voicemail directly to the web, and podcasting. In two clicks you get a custom phone line and record MP3s instantly to the web. You can then share via web (URL), email, iTunes, rss, twitter, and facebook 'outputs'.