Say that 5 times fast!   A lot goes into a well made Voice Mashup.  Not only do Voice Mashup API apps have to find a target audience, but in order to gain popularity it is essential that they generate plenty of location-specific content.  One of CallFire’s earliest clients, GeoGraffiti.com has done a pretty good job at that.  

GeoGraffiti's Voice Map has grown from a 3-user proof-of-concept, to over 10,000 users on iPhone, Android & GeoGraffiti.com, all in less than 1 year.