$urls= @("http://sharepoint.local", "http://anothersharepoint.local")

New-EventLog -LogName "Application" -Source "SharePoint Warmup Script" -ErrorAction SilentlyContinue | Out-Null

$urls | % {
    $url = $_
    try {
        $wc = New-Object System.Net.WebClient
        $wc.Credentials = [System.Net.CredentialCache]::DefaultCredentials
        $ret = $wc.DownloadString($url)
        if( $ret.Length -gt 0 ) {
            $s = "Last run successful for url ""$($url)"": $([DateTime]::Now.ToString('yyyy.dd.MM HH:mm:ss'))" 
            $filename=((Split-Path ($MyInvocation.MyCommand.Path))+"lastrunlog.txt")
            if( Test-Path $filename -PathType Leaf ) {
                $c = Get-Content $filename
                $cl = $c -split '`n'
                $s = ((@($s) + $cl) | select -First 200)
            }
            Out-File -InputObject ($s -join "`r`n") -FilePath $filename
        }
    } catch {
          Write-EventLog -Source "SharePoint Warmup Script"  -Category 0 -ComputerName "." -EntryType Error -LogName "Application" `
            -Message "SharePoint Warmup failed for url ""$($url)""." -EventId 1001

        $s = "Last run failed for url ""$($url)"": $([DateTime]::Now.ToString('yyyy.dd.MM HH:mm:ss')) : $($_.Exception.Message)" 
        $filename=((Split-Path ($MyInvocation.MyCommand.Path))+"lastrunlog.txt")
        if( Test-Path $filename -PathType Leaf ) {
          $c = Get-Content $filename
          $cl = $c -split '`n'
          $s = ((@($s) + $cl) | select -First 200)
        }
        Out-File -InputObject ($s -join "`r`n") -FilePath $filename
    }
}

 <?xml version="1.0" encoding="utf-16"?>

 <Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">

   <RegistrationInfo>

     <Date>2011-01-26T00:00:37.2455395</Date>

     <Author>DOMAIN\ikarstein</Author>

   </RegistrationInfo>

   <Triggers>

     <CalendarTrigger>

       <Repetition>

         <Interval>PT5M</Interval>

         <Duration>P1D</Duration>

         <StopAtDurationEnd>false</StopAtDurationEnd>

       </Repetition>

       <StartBoundary>2011-01-26T00:00:37.2455395</StartBoundary>

       <Enabled>true</Enabled>

       <ScheduleByDay>

         <DaysInterval>1</DaysInterval>

       </ScheduleByDay>

     </CalendarTrigger>

   </Triggers>

   <Principals>

     <Principal id="Author">

       <UserId>DOMAIN\spfarm</UserId>

       <LogonType>Password</LogonType>

       <RunLevel>HighestAvailable</RunLevel>

     </Principal>

   </Principals>

   <Settings>

     <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>

     <DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>

     <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>

     <AllowHardTerminate>true</AllowHardTerminate>

     <StartWhenAvailable>false</StartWhenAvailable>

     <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>

     <IdleSettings>

       <StopOnIdleEnd>true</StopOnIdleEnd>

       <RestartOnIdle>false</RestartOnIdle>

     </IdleSettings>

     <AllowStartOnDemand>true</AllowStartOnDemand>

     <Enabled>true</Enabled>

     <Hidden>false</Hidden>

     <RunOnlyIfIdle>false</RunOnlyIfIdle>

     <WakeToRun>false</WakeToRun>

     <ExecutionTimeLimit>P3D</ExecutionTimeLimit>

     <Priority>7</Priority>

   </Settings>

   <Actions Context="Author">

     <Exec>

       <Command>C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe</Command>

       <Arguments>-command ".\SharePointWarmup.ps1"</Arguments>

       <WorkingDirectory>C:\Program Files\SharePoint Warmup</WorkingDirectory>

     </Exec>

   </Actions>

 </Task>