A sleek pocket computer with easy note-taking and built-in GPS: could the new iPhone 3G be a good field tool? I hope some pioneer is giving it a try. Seems to me that it could easily host a topographic base map with geological overlay to show on that lovely screen, plus the waypoint logging of the typical GPS unit, plus quick input on the iPhone keyboard or recording oral notes. With a tricked-up iPhone and a standard Brunton compass, you'd have a good basic mapping outfit. Am I right? And what geology-related applications should developers be working on for the iPhone?