To Export the Application Pools on IIS 7 :

%windir%\system32\inetsrv\appcmd list apppool /config /xml > c:\apppools.xml

To import the Application Pools:
%windir%\system32\inetsrv\appcmd add apppool /in < c:\apppools.xml

To Export all you’re website:
%windir%\system32\inetsrv\appcmd list site /config /xml > c:\sites.xml

To Import the website:
%windir%\system32\inetsrv\appcmd add site /in < c:\sites.xml

To export/import a single application pool:
%windir%\system32\inetsrv\appcmd list apppool “MyAppPool” /config /xml > c:\myapppool.xml

For further information: Exporting and Importing Sites and App Pools from IIS