In an effort to help companies improve efficiencies through enhanced communication and collaboration, Microsoft recently developed 30 applications for Microsoft Windows SharePoint Services.
These applications were tailored to address the requirements of specific business processes (the link to these applications can be found in the "Relevant Resources" section). In addition, the applications served as a starting point for partners and developers to build deeper Microsoft Windows SharePoint Services solutions.
A white paper of various integration scenarios are published by Microsoft and it is available from this link
Useful links