Last night Joe Wilson delivered the Heckle Heard 'Round the World.
Not cool. I'm not saying this as a political statement or support of any political party. I'm saying this as someone who has to present and listen a lot.
When you're attending a speech, whether you agree or not, keep shtum.
If there's a Q+A portion, save your comments and questions for then. Upset about something? Take it off-line with the speaker.
related: Clarence Page discusses Congressional Etiquette (or lack thereof).