Although the article isn't mobile photography specific it includes links to some very informative tutorials. There's also some great ideas in here for inspiration. A few I want to try with my iPhone camera to see what results I achieve. Very informative reading and I hope some others might find it as informative as I did. Enjoy! And as always Happy Snapping!
http://www.smashingmagazine.com/2009/04/22/the-ultimate-photography-round-up/