http://blogs.msdn.com/helloworld/archive/2008/10/31/how-to-get-iis-web-sites-information-programmatically.aspx

How to Get IIS Web Sites Information Programmatically

I needed to get the location of IIS log files on my servers, after doing a quick investigation, I am quite amazed on how much information are exposed via managed code.

This snippet will return the name of the sites and the location of the log files.

foreach (DirectoryEntry Site in new DirectoryEntry("IIS://" + System.Environment.MachineName + "/w3svc").Children)
    if (String.Compare(Site.SchemaClassName, "IIsWebServer", StringComparison.OrdinalIgnoreCase) == 0)
        Console.WriteLine(Site.Properties["ServerComment"].Value.ToString() + " == " + Site.Properties["LogFileDirectory"].Value.ToString());

To get more information about what fields and method you can access, please refer to this MSDN doc: http://msdn.microsoft.com/en-us/library/ms524487.aspx.

Just remember, in Vista/Windows Server 2008, you will need to run that code with elevated privilege.