There are many technologies that can be used to enhance a conference. See a whole article for a nice overview.
Here are some which can / should be used.
For the presentations.
Online connection for presentations
Mobile phones / SMS comments / questions from remote participants
WLAN for all
Prepared space for bloggers
So they can comment live on the events.
- Audio recording of events
- Video recording of events
- Live audio streams
- Live video streams