The use of seperate iPods/music players (as well as the trend away from keeping music as files on your own device and more toward simply listening to such music from the 'cloud' or internet radio services), digital cameras, and gps have fallen off dramatically since their usage has been integrated into smartphones.
The better current smartphones contain a more than adequate point and shoot digital camera.
A smartphone allows you to immediately share/post an image with anyone online or with a similar device.
It also allows access to a world of apps, or applications, that perform specific functions. Popular apps include those for music, social networking, sharing your location with others, checking the weather, scanning barcodes in stores for price comparison, reading books, ordering lunch, allowing an individual to accept credit card payments, and of course, games.