ETA: Dave suggested this one:
Alan Horn, President, Warner Bros Entertainment
4000 Warner Blvd.
Burbank, CA 91522
I looked all over the Warner Bros studio site last night, but my searches are being sabotaged with references to the movie Contact so I couldn't find an address, email or phone number.
Today I tried the parent company. I'm not sure what names specifically to address it to.
Time Warner Inc.And Warner Bros Entertainment on the Time-Warner site turns up this:
One Time Warner Center
New York, NY10019-8016
Susan FleishmanIf anyone is better investigator, please tell me what you turn up.
Corporate Communications Office