iStalkr

iStalkr is a great application that allows you to show your friends how much cooler your iPhone is than their Nexus One.

The program is a magic trick that will convince your friends (or your teenage children) that you know where they are, anytime you want to. This application is great for April Fool's Day.
Here is how it works: fire up iStalkr, wait for the "uplink status" light to turn green, select their name from your Contacts, click on their phone number and watch as iStalkr shows a map centered right where you (and they) are standing! After the initial shock wears off, your audience will guess that iStalker simply draws a map of the current location, labelled with someone's phone number. To prove this isn't true, you select someone else from your Contacts list who is not there with you. iStalker draws a map showing that they are at home, or at work.