If you are already testing project server 2007 and going to install it, be aware that there are guidelines available to install project server 2007. Microsoft highly recommends reading these guidelines before installing the server.

http://officebeta.iponet.net/en-us/help/HA101639911033.aspx

These guidelines include Upgrading, Installing project server with or without WSS Version 3 and deployment and planning the deployment flowcharts.

Hope this will help

Regards,

Jerry