Short Range Locator?

[Snoman002]

You know how it is, your at the local adult beverage super store and your buddie says he is going to the beer fridge and you head over to look for some Jack Daniels, next thing you know you can't find your buddie and you spend precious drinking minutes wandering the store.

Ok, to be honest, your at Super Walmart and your kid is annoying you and you just want to find your wife, drop the kid off and head over to electronics for a few precious minutes. But you head over to the candle section where the wife said she would be and she isn't there. So you spend the next 20 minutes wandering through the feminin clothing section just to find your SO in the baby section. And then after that she decides its time to go and you miss out on staring at the 21.5" Acer wide screen monitor and oogling Ipod accessories (wishing they were for your phone).

Is there any software out there that is a short range locator. Perhaps something that searches for the other handsets WiFi, if that would work.