Off-line usability, data collection (yeah you can do it with some web tricks now, but an app may be more stable) Better UI than you can get via web (i.e. provi

Off-line usability, data collection (yeah you can do it with some web tricks now, but an app may be more stable) Better UI than you can get via web (i.e. provide walking directions with a compass) Anything that uses sound/music or highly responsive graphics like action games.