Educreations turns your iPad into a recordable whiteboard. Creating a great video tutorial is as simple as touching, tapping and talking. Explain a math formula... Create an animated lesson... Add commentary...
Audacity is free, open source, cross-platform software for recording and editing sounds.
Second Life is a free 3D virtual world where users can socialize, connect and create using free voice and text chat.
Designing a web site for you class is as simple as dragging and dropping pictures, text and files. And it's FREE.