They’ll be amazed with the iPhone Radar when you show them who’s in the area. The iPhone Radar even shows them which direction the people are in.
There’s a USA iPhone Radar and a UK iPhone Radar.
You’ll not need to jailbreak your iPhone, just visit myijump.com/radar/ using the Safari browser.
UPDATE: A friend asked me to put together a ‘Boob Radar’ so he could impress with his iPhones ability to hunt out the best pair of tits in the pub 🙂 – Check out myijump.com/radar/boobs/