As a compulsive field note taker myself (and the author of ExpoDev) I'd like to add that ExpoDev does capture most of what you prescribe here and that it will soon be available for iOS (iPhone and iPod Touch devices). Down the road I plan to add even more note taking capabilities, like scene sketching and documenting metering reading points, etc... I have found that keeping good notes has been the key to getting good exposures as it allows me to more easily learn from my mistakes.