Here are some of the cool things you can do by piping appcmd commands together in IIS7.

Application Pools

1. Recycle all application pools (replace recycle with start/stop to start/stop all apppools)
appcmd list apppool /xml | appcmd recycle apppool /in

2. Stop application pools with word "cheap" in it
appcmd list apppool /name:"$=*cheap*" /xml | appcmd stop apppool /in

3. Set property enable32BitAppOnWin64 to true for all apppools (Filter apppools as in 2 if needed)