PSMDTAG:FAQ: How do I set the title of my console window?  ANSWER: $Host.UI.RawUI.WindowTitle = “PowerShell ROCKS”

Jeffrey Snover [MSFT]
Windows PowerShell/Aspen Architect
Visit the Windows PowerShell Team blog at:    http://blogs.msdn.com/PowerShell
Visit the Windows PowerShell ScriptCenter at:  http://www.microsoft.com/technet/scriptcenter/hubs/msh.mspx