Here's an app that fixes a common problem in recording videos: recording horizontal, widescreen videos no matter how you're holding your iPhone. As you rotate the phone from landscape to portrait, or vice versa, Horizon uses the iPhone's sensors to keep the aspect ratio the same. The phone rotates around a virtual frame, rather than being the actual frame. The transitions aren't perfect yet, but it works pretty well and I imagine camera shake can be ironed out in future updates. Horizon lets you capture video in other aspect ratios as well, has few different filters to choose from, and lets you share your videos to social networks like Twitter and Facebook. Download it from the App Store for a dollar during their launch sale.