"The conference slides were hosted on the DeWitt web site and you are given a password to enter and listen to the papers in your own time. There was no live question and answer session but you were encouraged to contact the speakers."
"A positive was that you could listen to the papers without the cost of travelling, but downloading all the slides was not easy."
"A big problem I found with an on-line presentation is that you get disturbed at your desk by people coming to talk to you or the phone ringing. If you attend a conference, then you can give the papers your undivided attention."
So it looks as if there's still some mileage left in the old conference format of travel and face-to-face networking.