Using a new PowerShell Remoting application (in beta) from /n software and Mobile SSH from Idokorro, I was able to to a remote SSH session from my BlackBerry to a remote Windows server and run PowerShell commands!
PowerShell Remoting basically gives you a regular terminal window (similar to Telnet), except you are in PowerShell. No need for all the overhead of any kind of GUI, and you can run this from a mobile!
If you need PowerShell remoting *today*, you should check it out!