Wonderful iPhoneography  Resources

Pixels at an Exhibition

"Aim well, shoot fast, and scram."—Henri Cartier-Bresson.
Aim well, shoot fast, and app that bitch until it sings."—Knox Bronson. (founder of Pixels at an Exhibition)

iPhoneArt.com

This is the go to site that has links to many of the others mentioned here

Life in LoFi

iPhoneography Central

The App Whisperer

iPhoneography.com

The Mobile PhotographyAwards 

Mobil Photo Group

Only the very best mobile photographers are invited one each year to be part of the group

Learning Resources

The Beginner’s Lens

Free downloadable pdfs to help you along.Also iPhone Essentials is linked to from the above site. A pay for site with excellent learning videos.