Using VoiceThread for Consultation and Participation

I've been asked by Participation Works to put together a series of pages on 'Technologies for Youth Participation' - so I'm looking out for all manor of technologies and tools that can be used to engage young people effectively in decision making and creating change.

From offline electronic voting keypads and twittering at events, through to collaborative online forums that allow young people to influence a policy process over the long term - I'm interested in hearing from you about: