There is a lot of great information available to help you learn IIS7 over at IIS.NET.
Also available are short video tutorials. Unless I am missing something there is no overall list of the available videos so here is one I've created...
Another resource worth considering is the Internet Information Services (IIS) 7.0 Resource Kit with over 700 pages of detailed information about IIS7. The book comes with a companion CD which includes some sample PowerShell scripts for managing IIS7 as well as the entire book in searchable, electronic format.