Inspired by http://lostechies.com/erichexter/2012/11/02/download-all-the-build-videos-while-you-sleep and http://blogs.msdn.com/b/jasonn/archive/2008/06/13/downloading-files-from-the-internet-in-powershell-with-progress.aspx

Download build videos.ps1

function downloadFile($url, $targetFile)
{ 
    "Downloading $url" 
    $uri = New-Object "System.Uri" "$url" 
    $request = [System.Net.HttpWebRequest]::Create($uri) 
    $request.set_Timeout(15000) #15 second timeout 
    $response = $request.GetResponse() 
    $totalLength = [System.Math]::Floor($response.get_ContentLength()/1024) 
    $responseStream = $response.GetResponseStream() 
    $targetStream = New-Object -TypeName System.IO.FileStream -ArgumentList $targetFile, Create 
    $buffer = new-object byte[] 10KB 
    $count = $responseStream.Read($buffer,0,$buffer.length) 
    $downloadedBytes = $count 
    while ($count -gt 0) 
    { 
        [System.Console]::CursorLeft = 0 
        [System.Console]::Write("Downloaded {0}K of {1}K", [System.Math]::Floor($downloadedBytes/1024), $totalLength) 
        $targetStream.Write($buffer, 0, $count) 
        $count = $responseStream.Read($buffer,0,$buffer.length) 
        $downloadedBytes = $downloadedBytes + $count 
    } 
    "`nFinished Download" 
    $targetStream.Flush()
    $targetStream.Close() 
    $targetStream.Dispose() 
    $responseStream.Dispose() 
}

[Environment]::CurrentDirectory=(Get-Location -PSProvider FileSystem).ProviderPath 
$rss = (new-object net.webclient)
#Set the username for windows auth proxy
$rss.proxy.credentials=[system.net.credentialcache]::defaultnetworkcredentials
$a = ([xml]$rss.downloadstring("http://channel9.msdn.com/Events/Build/2012/RSS/wmvhigh")) 
$a.rss.channel.item | foreach{  
    $url = New-Object System.Uri($_.enclosure.url) 
    $file = $_.creator + "-" + $_.title.Replace(":", "-").Replace("?", "").Replace("/", "-") + ".wmv"
    if (!(test-path $file)) 
    { 
        #$wc = (New-Object System.Net.WebClient)
        #Set the username for windows auth proxy
        #$wc.proxy.credentials=[system.net.credentialcache]::defaultnetworkcredentials
        #$wc.DownloadFile($url, $file) 
		downloadFile $url $file
    } 
}