Let's think about this from the standpoint of a person just showing up on the scene. He's most likely going to see mp3car.com and mp3car.org and assume they are the same or just not know what's going on. Why not offer to take over on the site? Look in mp3car's whois listing and give him a call if necessary.
I just think it'll cause more harm than good to have two seperate, but identical sites.
*Edit* Or fax, if necessary. Fax = 410-825-3240 Did you try
moon@home.com?