Is there a place where I can get this utility for diagnosing service broker in sql server.
Ssbdiagnose.exe is a command line application that comes with Microsoft SQL Server 2008. It usually resides in C:\%ProgramFiles%\Microsoft SQL Server\100\Tools\Binn. The documentation can be found here.
EDIT: as Greg pointed below, the .exe is usually in the 64 bit Program Files directory. My bad!