Check out the notes buried near the bottom of this article on WinRM: WinRM: Remote Management Across the Internet

Something else to consider. Sometime before the end of the year an upgraded CTP (Community Technology Preview) version of Windows PowerShell will be released, an upgrade that will enable you to run most Windows PowerShell cmdlets against remote computers. The catch? This new version of Windows PowerShell also relies on WinRM as its remote transport protocol. If you?re interested in using Windows PowerShell to manage remote computers you?ll need to download and install WinRM on your Windows XP and Windows Server 2003 machines.

So this is good and bad.  It’s great that now we know the direction MS is headed with regards to remote management in PowerShell.  It sucks to have to install yet another piece of software on all your servers though.  For many IT shops this is a non-trivial thing.  As Gaurhoth on #Powershell advises, it might make sense to get WinRM in your new server builds now:

I don’t have to do change management on ‘new’ stuff…. getting WinRM installed on existing servers might be a little harder.