You've probably been to their "contact us" page, but if not here is what they show:
Google Contact Us
Google Inc.
1600 Amphitheatre Parkway
Mountain View, CA 94043
phone: (650) 253-0000
fax: (650) 253-0001
http://www.google.com/intl/en/contact/index.html
They also have some help forms there, etc.
But I haven't been able to find any direct email addresses either.
Great! Thanks so much.