Microsoft announced today a new Community Technology Preview (CTP) for Windows Server 2008. This latest release, available to MSDN subscribers, TechNET subscribers, and Connect customers, includes IIS 7.0 as part of the Server Core. Microsoft originally announced the IIS 7.0 on Server Core installation option at Tech Ed. And with this latest CTP, customers can try it out.
You can download the CTP and get started with Server Core and IIS 7.0 here.