I'm at Columbia Business School for Focus on Locus, a conference on location-aware gizmos and gadgets, and I've got a hot tip for you on this, iPhone Day. Tom Ted Morgan is CEO of Skyhook Wireless, and he says that turning the new 3G sideways, like you might do to use the new scientific calculator feature, hugely decreases the accuracy of the iPhone's GPS. So if you're using your unit to find your way around, keep it oriented straight up to the sky. So now you know.