The name "SharePoint" actually has several meanings.  Microsoft Office SharePoint Server 2007 (MOSS) is an enterprise collaboration, content and knowledge management server.  Windows SharePoint Services (WSS) is a Windows Server component which provides many of the core services and features of MOSS.

Microsoft Office SharePoint Server 2007 is a new server program that is part of the 2007 Microsoft Office system. Your organization can use Office SharePoint Server 2007 to facilitate collaboration, provide content management features, implement business processes, and supply access to information that is essential to organizational goals and processes.

You can quickly create SharePoint sites that support specific content publishing, content management, records management, or business intelligence needs. You can also conduct effective searches for people, documents, and data, participate in forms-driven business processes, and access and analyze large amounts of business data.

Team Foundation Server relies heavily on Windows Sharepoint Services to provide a platform for the Team Project Portals.  These Sharepoint sites are used as the collaboration hub for application development project documentation, including requirements, project plans and statuses, and other development-centric documentation.  These project portals can also be the outward-facing view of the project.  Project reports, documents and team information can be accessed through a web browser by interested stakeholders.