This blog describes some tools for live conference speakers to help make presentations more interactive:
"here are a few tools that, thanks to the increasing availability of wireless connectivity at conference centres these days, might help to turn your passive listeners into a bunch of multitasking audience collaborators."
These tools include TodaysMeet, for backchannel communications, live polling at Urtak, and Sync.in which will allow collaborative note-taking. Using all these tools will make a live presentation seem much more like an audio-video conference in WiZiQ or Elluminate.