iPhone app to show me my locations database
I'm afraid that, without a jailbreak, you won't find any apps that do this for you using your 'locations database' (the "tracking" you're talking about). There are two main reasons:

1: According to Apple, the file is protected. Besides, apps don't get access to system files anyway.

2: Such an app would probably scare some people, and Apple would never allow it on the App store.

Maybe we'll see some apps for jailbroken phones, but I wouldn't expect anything to come to the standard App Store.