405 - ‘Method not Allowed’ adding service hosted in IIS7
<%windir%>Microsoft.NET/Framework/v3.0/Windows Communication Foundation/ServiceModelReg.exe -i
...then
<%windir%>Microsoft.NET/Framework/v2.0.50727/aspnet_regiis -i -enable
This mapped the proper isapi dll's to the *svc extension, among other things.
Bless Microsoft...