The penny has finally dropped in the Enterprise Library team that the library is being used in non-corporate data centre environments, in particular, Medium Trust ASP.NET 2.0 hosting platforms like our own. Here's the article on Tom Hollander's (Product Manager) blog -

http://blogs.msdn.com/tomholl/archive/2006/06/30/652955.aspx

The patch is here -

http://www.gotdotnet.com/codegallery/releases/checkfordownload.aspx?id=295a464a-6072-4e25-94e2-91be63527327&ReleaseId=79deb790-2442-420f-80d5-7adc3827c867