PowerShell - List all SQL instances on my system?

Question

Is there a Powershell command to list all SQL instances on my system? (MS SQL 2008)

Answer 1

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SqlWmiManagement") | out-null
$mach = '.'
$m = New-Object ('Microsoft.SqlServer.Management.Smo.Wmi.ManagedComputer') $mach
$m.ServerInstances