Secrets aren't much good once you've told your friends about them, so when PostSecret - a blog which invited readers to anonymously send in their own secrets - was opened, it was like the secret was reinvented. Secrets take on a whole new form when received from a completely different quarter of the world from complete strangers, so Visuamobile has decided to use the sharing power of the iPhone to dispatch secrets with their new app Earth Secrets (Free, App Store), demonstrated in this jaunty video:

A while ago developers Gripwire released iHearClear ($0.99, App Store), an application which gives an iPhone or iPod Touch (with external microphone) the ability to function as a hearing aid. Though the target audience was the hard of hearing, the developers found that many of their customers were picking up iHearClear for entertainment. With this in mind, the developers set out to make an app with similar functionality, but with an enhanced and retooled UI, resulting in Amplitude ($0.99, App Store).