The documentation I found for configuring IIS with Silverlight doesn't seem to work in my case. After creating the Devsamples virtual directory and creating the Mime types below, I received a type error in the web config. This was resolved by deleting the devsamples directory and specifying the directory name as Quickstarts instead. I also had to set the ASP.NET extensions to 2.0.
Extension
MIME Type
dll
Assembly
xaml
XAML file
py
IronPython file
jsx
Managed Jscript file
pdb
.NET Symbols file
IIS configuration instructions for hosting the 1.1 Quickstart samples - Silverlight