MSDN Small Business Developer Center
Are you a developer new to Microsoft and curious about the tools we offer to help build applications for small businesses? If you are, visit the Small Business Developer Center, an MSDN property that is focused on providing practical, actionable platform guidance for developers working with small businesses.
To get you started, there's a series of common development tasks that involve working with a sample application for a small business called Wingtip Toys (a small toy vendor with several remote sales people). Each one includes video, hands-on labs, and the use of free products that you can download, showing you how to integrate sales data using a Windows App, build reports, create a web presence etc.