Guys, I'm dead serious.
http://www.digitaljournalist.org/issue0305/cameracorner.html
http://digital-lifestyles.info/2005...-trip-sponsored-by-sony-ericcson-pr-own-goal/
http://www.pdnonline.com/pdn/newswire/article_display.jsp?vnu_content_id=1000977263
http://chronicle.com/wiredcampus/article/1753/photojournalism-leaps-into-the-cellphone-age
plus countless Abu Gharib photos too!
Any tips on image tweaking from the iPhone?
I think you raise an excellent topic. Although, it depends on what type of photography you do (we do weddings, so only need/use Pro equip.) and what output you require.
It's important to always have a camera with us, so our iPhone is certainly better than not having one but we also always have a tiny Canon SD700IS in our pocket (takes video too).
Here is a decent iPhone shot: