Protection of iPhone Apps made easier with Locktopus [Jailbreak].
There are tons of applications available on the Cydia Store and a recent one to be released has been named Locktopus, which is a tiny app and lets you password protect your apps on your iPhone or iPod touch, so that no one can access your private information.
The app lets you protect any application on your iPhone, Restricting others from accessing your iPhone or iPod Touch's Information and making them safe.
The Locktopus App is available at Cydia for 2.00 US$ which is a great price of an app which lets you protect your iPhone apps and information from unwanted access. Keep in mind that a jailbroken iPhone is required to get the app working.