We just finished up a 2 day audience response job at an pharmaceutical investigator meeting in San Diego, CA. They made great use of the audience response system and on the second day even utilized some on-the-fly ARS questions. There was a great response to the music used on the countdown timers on the interactive questions. It went so far as the group passing out candy to people that guessed the correct artist and song title.
Also, the A/V guys at Reaction Audio Visual were spot on. Big thanks to Jeff Stora and Andy Struck for having us help out. I hope that we can work with these companies again.