Just thought I'd mention a new app I've been toying with, works on the iPhone. It's called Instagram, it was free one day on AppAdvice (a 1.99 app that does a good job of listing other apps--clearly I have too much time on my hands!).
Anyway, it takes a picture, no bells or whistles, but then lets you add a funky filter (sepia, etc.) as a second step. As a final step, it lets you post instantly to twitter, facebook and Flick'r, the service I normally use.
Frequently I'm on the go without my camera and I just have to post something on AC. This makes it really, really easy.
Paul