How to block my gmail id because I forgot gmail id password ?

How can trace gmail user ids?

I am getting harassing myspace messages, now emails, email matches myspace account. I know I can't trace the gmail account but can I figure out who this is through the myspace account? Pretty much a blank account no friends just Tom... what a looser this guy must be... LOL :D

I've been receiving e-mails from a g-mail ID. I want to get details like who does it belong to and when was the profile created. If I could trace the IP address then nothing like it.

Is there such thing as an app that traces an IP to a physical location? You know... like in the movies? I've tried a few that get it down to the city, but no further. Is there such a thing? Thanks!