(sorry don't alow to post link, i'm a new mem)
Good luck ^^
I hope the person who picked up it will return the phone to you...
Lost is lost leave it. Nothing to do
1- Use MobileMe
2- Use "Find My iPhone" via MobileMe
3- Install an application on your iPhone called "If Found".
4- Use iHound.
5- Use iLocalis
6- Check local police stations and lost property stations in the vicinity of where you lost your iPhone
SocialCubix is the iPhone Application Development Company