We have an application that integrates with Active Directory. Specifically, it's a single sign-on feature that allows the user to log into the app based on what Active Directory account they are currently logged into Windows with.
In IIS 6 it would return values to the effect of:
LogonUserIdentity.Name : domain\user_name
Environment.UserName : u...
Skills: .net, asp.net, active directory, c#, internet information services (iis)