This is a superb collaborative video editing suite. You and your class can invite each other as collaborators. It has a great range of tools and toys to make some great movies. Host your video on the site or export to YouTube or Vimeo.
http://ictmagic.wikispaces.com/Video%2C+animation%2C+film+%26+Webcams
Wow. What a find! And it's all free...
This is from their blurb:
".... we invite you to get familiar with Lightworks, an Academy and Emmy award winning professional-grade editor with over 20 years of history in the film and broadcast industry. Having cut hundreds of films such as Pulp Fiction, The Departed, Centurion and Shutter Island, it includes a full feature set of editorial tools -- from advanced trimming and media management, to stereoscopic support and realtime effects including multiple secondary colour correctors. Lightworks has an advanced effects pipeline, utilizing the power of your GPU. And with support for up to 2K workflows with realtime effects, it is the most advanced editing application available."