This site describes how to configure IIS to serve Avalon applications. You just need to adjust the content expiration setting and register the appropriate mime-types and file extensions.
http://windowssdk.msdn.microsoft.com/library/default.asp?url=/library/en-us/wcp_conceptual/html/c6e8c2cb-9ba2-4e75-a0d5-180ec9639433.asp