Microsoft has introduced a huge list of Applications or templates for Windows SharePoint Services. At no extra cost to organisations who have licensed WIndows Server 2003 :
These application templates are tailored to address the needs and requirements for specific business processes or sets of tasks for organizations of any size. The applications are the first out-of-box custom scenarios for the Windows SharePoint Services platform, though they also provide a starting point for partners and developers looking to build deeper Windows SharePoint Services solutions.
You can find the complete list and a brief description per application and the downloads here : Applications for Windows SharePoint Services