Microsoft released a bunch of how-to guides for various things new to Windows 2008. You can grab them all from the MS Download page.
Things I would definitely check out are:
- Deploying SSTP Remote Access Step by Step Guide.doc
- Server_Core_Installation_Option_of_Windows_Server_2008_Step-By-Step_Guide.doc
- Windows Server 2008 TS Gateway Server Step-By-Step Setup Guide.doc