Looking for video presentation software

i teach @ local design college , offer video conferencing students can view home or, in event of guest speaker, in classroom.

i'm looking allow show work local desktop such things demonstrations, show work, etc.

i'm open though have small budget this. tips in advance.

 

most flash based.

example:
http://www.adobe.com/products/adobeconnect/features.html
http://www.webex.com/

 

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