There is not a specific event or alert that send email to people outside of team members and specifically for when the project is published. You will have to do it the old fashion way of using email or you can custom app to periodically check the project
database for new publish date and use that trigger to send an email.
In project 2007, you can set up an event to do this for you, but I dont believe events are not available in 2003.
Chers
Michael Wharton, MBA, PMP, MCT, MCSD, MCSE+I, MCDBA
www.WhartonComputer.com