Jeff Wettlaufer has put together a short video showing one of the cool new features soon to arrive when R3 is released
OS Deployment enhancements in Configuration Manager 2007 R3
Check it out here > http://blogs.technet.com/systemcenter/archive/2010/01/20/os-deployment-enhancements-in-configuration-manager-2007-r3.aspx
Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2010/01/21/quick-video-of-configmgr-r3-feature-prestaged-media.aspx