My settings match what you've described below funkusmunkus:
Group: Everyone
User access via file sharing or user ftp: Write = Admin, Read = group
Public access via web or anonymous ftp: Entire Internet (no password required)
Execution of dynamic content (CGI, PHP, SSI): disabled
My server is setup as Server and Gateway...could it not be letting port 80 traffic though?
I'm so stumped....