Hipstamatic.

For all iPhone, iTouch, and iPad 2 users, I highly recommend purchasing the Hipstamatic app for $1.99. It's easily the most used app I own. It comes with a few different lenses, flashes and films. But there are more you can acquire through in app purchases for $.99. I have all packs currently available and they are all amazing. I mean, you can take a picture of a shoe and it will look awesome. I've had the app since it came out and I still use it all the time. Here are a few photos I've taken with the app: