Back in the stone-knives-and-bearskin days of 2005, I wrote about the rise of camera phones: "Will we soon take all of our pictures with a camera phone? Probably not." Shows what I know. In just six years, camera phones have evolved from taking pictures that looked sort of like Gauguin paintings to snapping sharp, high-quality photos—and in the process, have become practically ubiquitous lifestyle companions. Everyone, it seems, snaps photos for Facebook, Flickr, and e-mail with their mobile phone. The phone in your mobile phone is not yet the equal of a digital SLR, so you still need to take special care to take great pictures this way, but it's amazing how good your results can be. And you can do things with a mobile phone that are difficult or impossible to do with a traditional camera. Case in point: this week, here are five awesome iPhone apps designed for photographers.