Sharepoint 2007 - Poweshell Script to Delete site.

[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.Sharepoint”)

$site = New-Object Microsoft.SharePoint.SPSite("http://md1devvmossapp3:15801/")

foreach ($web in $site.AllWebs) {

  try

{

  $web.Delete()   

  $web.Dispose()

  Write-Host $web.Url " : Is deleted"

  }

  catch [System.SystemException]

{

    write-host “Execution stopped due to: “+$_.Message

}

}

Reference : 

http://blogs.msdn.com/b/mcsnoiwb/archive/2008/11/14/sharepoint-and-powershell-practical-tips.aspx