One term associated with Web 2.0 is 'rich media'. Audio and video can be streamed, embedded in texts, and distributed as podcasts. Presentations can be streamed live and archived. Collaborators can view media streams and mark them up on line. Here are some sites to explore.

Site	URL	Document Type
Chinswing	http://www.chinswing.com/	Audio blogging site
VoiceThread	http://voicethread.com/	Audio blogging with picture description
Snapvine	http://www.snapvine.com/account/homepage	audio blogs with pictures
Ustream	http://www.ustream.tv/	video conferencing
You Tube	http://www.youtube.com/	Video blogging
Teacher Tube	http://www.teachertube.com/	Video blogging for education
flashmeeting	http://flashmeeting.open.ac.uk/	Virtual meeting website