iphone toy

i want to make a game for the iphone where it uses it's GPS tracking stuff and you have to use the headphones which gives you information on if there's an enemy nearby and you have to stalk the enemy (like a metal detector detects metal) and then hit a button to kill it. and you get points. it'd be like a virtual geocache. there would be a website where people post where they've found "fifty pointers" and there'd be moderators which have the ability to place monsters in certain places.

this idea isn't totally original, it's from an article someone posted about toys ages ago that i can't find, he actually had a working version of it.

but i like geocaches, and a virtual one would be kind of cool.

but i hate iphones. =/

[edit: i found this! which is also a cool idea! video!]