Leader/Audience viewing modes
Allow the author of a slide to set the presentation into "audience mode"
Where the authors slide position is followed by the anyone else with the link.
This would kill elluminate webex and even google hangouts when presenting via voice calls as the quality can't be matched over video compression.
This would also be perfect for crowd participation for iframe style content where things like audience voting can be started / turned off
This would also be great for launching live events via a slid.es deck

It’s now possible to broadcast a presentation in real-time to your audience. Find out more: http://help.slid.es/knowledgebase/articles/333924
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Anonymous commented
I don't know what to say, this is revolutionary!