Update 12/2015: A Powershell version of this article is here.

There are several ways to do this, but the method I prefer to use is GET-QADUser command from the Quest Active Server Roles PowerShell module, as it will dump the information I want with a minimum of fuss.

1. Start the ‘ActiveRoles Management Shell for Active Directory’ console
2. Enter the following command string
   Get-QADUser -sizelimit 0 | Select-Object sAMAccountName, DisplayName
3. and then press EnterSamAccountName    DisplayName
DaggF             Fred Dagg
CollinsP          Paul Collins
SprouleK          Ken Sproule
ReithP            Peter Reith
SmithC            Coach Smith
RookeM            Mike Rooke

Or if I want to dump it out to a CSV file, so I can look at it in Excel:
Get-QADUser -sizelimit 0 | Select-Object sAMAccountName, DisplayName | Export-CSV 'c:\temp\AllDomainUserNames.CSV'

To dump all the user details out, you could doing something like:
Get-QADUser -sizelimit 0 -IncludeAllProperties -SerializeValues | Export-CSV 'c:\temp\AllDomainUserDetails.csv'

Related posts:

Getting a list of users in an Active Directory group. Getting a list of users in your AD domain via Powershell Detecting inactive computers in your AD domain.

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