I believe it could be just an website with video, slides, downloadable documents, a forum on a subject eventually with a built-in Question-and-Answer functionality and a realtime videochat possibilities (both organic amongst the online clients and organised by specialists at certain moment).

How far off-beat is my view on eSeminars ?

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Pieter,
Thanks for your question about eseminars. You are right on target about what they are – presentations that usually include slides (powerpoint often), along with a video or audio narration. People register to take the online seminar, and they can participate with the moderator (and sometimes other attendees) through tools. Some providers of eSeminar services are On24 and BrightTalk, and Ziff Davis Enterprise’s eSeminars site is here: http://www.eseminarslive.com/. Thanks for your question! -Melissa