Filed under: iPhone, SDKThe Pearson Education's Voices That Matter Conference series will be holding their second iPhone Developers Conference on April 24-25 in Seattle. Leading authors and experts (including our very own Erica Sadun) will converge for two days to share their knowledge about developing for the iPhone OS. Development for all iPhone OS devices -- iPhone, iPod touch, and iPad -- will be covered and with the release of the iPhone OS 4 SDK yesterday, you can bet