Heard it through the grapevine:

This is a public release for our developer community to actually get their hands on the framework code for the ASP.NET 2.0 SQL providers (as well the AzMan role provider) so they can see how we built them, and use the code to pattern providers for other platforms that we don't directly support (Oracle, DB2, etc…).

http://msdn.microsoft.com/asp.net/downloads/providers/default.aspx?pull=/library/en-us/dnaspp/html/asp2prvdr01.asp