Mad props to Craig Andera for his article on how to mix Windows Authentication with Forms/anonymous on an ASP.NET web site:
http://pluralsight.com/blogs/craig/archive/2004/07/24/1699.aspx
I'm using this at my job to allow our support staff to automatically login to our customer's applications if they access the application from within our coporate network.
Prittay, prittay, prittay cool!