BizTalk Server in a nut shell

BizTalk Server is built completely around the .NET Framework and Microsoft Visual Studio® .NET. It also has native support for communicating through Web services, along with the ability to import and export business processes described in BPEL(Business Process Execution Language).It should be in the following scenarios:

-- Connecting applications within a single organization, commonly referred to as enterprise application integration (EAI)-- Connecting applications in different organizations, often called business-to-business (B2B) integration-- Connecting applications within a single organization, commonly referred to as enterprise application integration (EAI)-- Connecting applications in different organizations, often called business-to-business (B2B) integrationFor further details luk into http://biztalkblogs.com/
ample of articles and resources are available for BizTalk