I am using VoiceThread for students to create digital stories to share about their research projects. Other students will peer review, comment, and write a reflection. Use VoiceThread Search Box terms "online teaching" to find Projects created for Online Courses.
The primary purpose of VoiceThread is to provide students with the ability to collaborate with fellow students on their websites or save to MP3 or DVD. The tool is used by students to upload multimedia material by microphone, webcam, text, phone, and audio-file upload.
ReadWriteWeb published this list in August of 2010 - interesting and I can definitely see the potential in the tools and tech they featured!
I'll be looking into Wikispaces, VoiceThread, and SlideShare which I have not previously heard about.