You can find it over at http://msdn2.microsoft.com/en-us/windowsserver/default.aspx. We are currently working on getting some refreshed content up to the site – but for the moment it represents a great starting place before moving on to other sites such as http://www.iis.net
We have also made public the initial version of the Developer Story for Windows Server 2008. The developer story will be updated and enhanced as time goes on. Enjoy.