If the iPhone's standard camera is like a digital point-and-shoot, the Camera+ app is like a high-quality SLR lens. Developed by a professional photographer, Camera+ includes a burst mode for action shots, an image stabilizer and even a timer for self-portraits. But the real fun begins after you trip the shutter. The app lets you manipulate your photos with crops, borders, color tints and retro effects. For the iPhone user serious about taking beautiful photos, it's $1.99 well spent.