We've been experimenting with integrated SMS/GPS for a while now. The team was able to leverage a new service called DotGo to integrate our very own short message service with a .net application that performs a spatial query and returns the results as text. We're building a small J2ME interface for the blackberry that encodes field values into single character 'commands' with an appended location off the GPS chip. Once we tie the two together we'll have a way to collect location information and forms data from any Java enabled device over SMS.