The iPhone camera does have better resolution than the iPod Touch. I wish there were some way to adjust manual camera parameters, such as exposure and shutter speed.
@Art: After playing with Gaia GPS Lite yesterday on a day hike (I'll buy the real version if I keep the iPhone) and reading several forums, I learned that the GPS is disabled in Airplane mode as the GPS is part of the cellular transceiver chip. At least for the Verizon iPhone 4: disable airplane mode, enable location services, and turn off cellular data (3G). The cell phone transceiver will attempt to find the network and will be doing so at higher transmit power levels but the GPS will work. Unfortunately, here in the Midwest we have decent Verizon coverage (3G is iffy sometimes though) and I have not been in an area that has zero cellular coverage to test the GPS "off the grid" yet.
I find that the iPhone 4 draws about 10% of the battery per hour when used as a GPS with WiFi, Bluetooth, and 3G disabled. There has has to be a way to improve this.
My fear is becoming a smartphone robot that does nothing but stare at a 3" computer screen all day. This is all I see when "in town" anymore. I don't want to become that hence the reason I will probably only be activating the iPhone for travelling and long backpacking trips and use my regular phone at other times.
@Bradley: The posts you mention are what started me thinking about a smartphone.
@Amy: I remember reading your earlier posts and referencing the article by Alan. It was more specific for AT&T iPhone 4s with a removable SIM card, something the Verizon version cannot do. Your table comparing the various iPhone GPS apps is awesome! Thanks for your efforts and I'm glad you had a great trip.