Extending ISV Applications Utilizing Web Services

XML Web services literally can provide plug-and-play functionality with increased flexibility to adapt to change, more efficient use of reusable components, faster development of new capabilities, and platform independence to enable broader usage. Web services are now commercially available for a broad spectrum of functionality and data access opening up new and faster ways for ISVs to extend their application value and appeal to new and broader markets at a fraction of the previous cost of adding new value.

http://www.strikeiron.com/partners/DownloadISVAPIWP.aspx