Its amazing to think about all the gadgets the iPhone replaces:
-an mp3 player
-a digital camera
-a keychain flashlight (people used to carry those around)
... and lots of other stuff if you start to add up all the apps!
And yes, I did used to carry around my mp3 player and my phone everywhere :-/ Its why I was so excited when I heard Apple was making a phone. I thought, "FINALLY I don't have to carry both of them around!"
Remember when you had to wait to see the photos you just took? Shoot the entire roll of film, develop it (yourself or have a lab do it) find the ones you really like and order more prints or an enlargement.