sli.do gives your audience a voice
Whenever presenters stand up in front of a room full of people, they are usually armed with the normal tools people use such as PowerPoint, KeyNote, or Prezi. However, none of these tools allows the presenter to engage the audience when they have questions or when you want to poll them for an answer before moving on.
sli.do is an amazing tool that takes care of the lack of audience participation by literally giving your audience a voice. Using their smartphone or laptop, the audience members can use sli.do to ask a question of the presenter or participate in a poll for instant results and feedback.
I highly recommend sli.do for everyone who presents. It will likely add a bit of confidence to your talk because you know that you can engage your audience in a new way using sli.do.