You can use the volume up button on your iPhone earbuds to snap photos.

/via Shawn Blanc

Macworld:

iPhone and iPod touch: Tap App Store and then tap the Updates button at the bottom of the screen. At the top of the Updates screen tap Purchased. Locate an app you want to hide and slide your finger across its name. A red Hide button will appear. Tap that button to hide the app on all your iOS devices and in iTunes.