Getting an iPhone has done more for my photography than my Canon G9 or any point and shoot I have used. The ability to take great photos with something I am trained to have with me at all times allows me to capture images that I wouldn't be able to with my Canon 5d Mark II.
These photos were all taken with my iPhone over the last two weeks and filtered with the Instant Camerbag application.
Patriotic mail box
Reading some Hemmingway
My favorite part of photography is the ability to capture candid images that tell a story and help describe an aesthetic or lifestyle. iPhones help this happen.
Here are some more links,
iPhone Instants from Maine (Picasa).