One of the great features of iOS 5.1 is the addition of a Camera button on the Lock Screen. You no longer have to double-tap the Home Button to unveil it but instead you just slide the icon up, a la Windows Phone, and the Camera is activated.
But what if you don’t have iOS 5.1 (for whatever reason)? With Camera Grabber for iOS 5, you can have the same Lock Screen functionality. Needless to say that your iPhone has to be jailbroken but if that’s not a problem, head over to the source link below (or search the Cydia ModMyi Repo) to grab it for free.