Summary: Use Windows PowerShell to easily retrieve a list of all computer names on the network.

 How can I use Windows PowerShell to obtain a list of all the servers on the network so I can run a
           script against them without typing a bunch of names?

 Use the Get-ADComputer cmdlet from the Active Directory module
           (available via the Remote Server Administration Tools), for example:

(Get-ADComputer -Filter *).name