I think that keeping various channels of mobile communication involved makes it interesting for the user-base, and therefore, more engaging. For example, employing, mobile video (live streaming it as well as sending videos to mobile users), mobile photo documentation, text to voice messaging, recorded voice interviews w/constituency, in the field as podcasts, etc. What are the various channels to use with mobile activism and what are the best service providers to make these things happen (live 12seconds.tv, for example).