Searching through my iPhone and came across this picture that I hadn't used before.  I imported it into the new Photoshop Touch iPhone app and applied a few tweaks to give it more of a high saturation and contrast look.

The Photoshop Touch app looks good but I'm not sure the useability of having layers and masks on such a small screen.  Plus being use to Lightroom I like have have all the adjustment sliders available to balance the effects rather than selecting and applying each in turn.