There are lots of good information on Project Server 2007 and SharePoint Server 2007 available at Microsoft TechNet web site.  The following is not meant to be a full list but just a few I found very helpful.

Microsoft Office Project Server 2003 Online Books is great place for White Papers on Project Server 2003. It includes the following White Papers:

 Microsoft Office Project Server 2003 Configuration Planning Guide

 Microsoft Office Project Server 2003 Disaster Recovery Guide

 Microsoft Office Project Server 2003 Installation Guide

 Microsoft Office Project Server 2003 Single Computer Installation Guide

 Microsoft Office Project Server 2003 Small-Scale Installation Guide

 Microsoft Office Project Server 2003 Medium-Scale Installation Guide

 Microsoft Office Project Server 2003 Application Configuration Guide

 Microsoft Office Project Server 2003 Administrators Guide

 Microsoft Office Project Server 2003 Solution Planning Guide

 Microsoft Office Project Server 2003 Security Group Guide

  Microsoft Office Project Server 2003 Portfolio Managers Guide

  Microsoft Office Project Server 2003 Project Managers Guide

  Microsoft Office Project Server 2003 Team Leads Guide

  Microsoft Office Project Server 2003 Team Members Guide

  Microsoft Office Project Server 2003 Executives Guide

  Microsoft Office Project Server 2003 Resource Managers Guide