Hi,

I have a request to log the site that users log into.  I figure the easiest way to do this is through a logon script.  Since I don't want to install the AD ps cmdlets or Quest tools on every machine, will it be easier to just call .NET?

You might not even have to do that. If the computer is also in the site that the user is logging in to. You can use this one line to get the site name.
(It is using .Net, but not doing any real heavy lifting in Active Directory.)

[System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]::GetComputerSite().Name