When to use SQL Server 2005 inbuilt Web Services?

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When to use SQL Server 2005 inbuilt Web Services?: "SQL Server 2005 allows stored procedures and functions to be exposed as web services direct from the database without any need to be running IIS. To do this, SQL must be installed on Windows Server 2003 to take advantage of the kernel mode http.sys. (Hmmmmm - I see Windows XP Sp2 also has kernel mode http.sys- something to try later on).
They are very easy to setup - which then leads to the obvious next question which many ISV have asked me 'When would you use them over ASP.NET web services'. The answer is a 'it depends' answer but as a rule of thumb..."