Updated version: Download MMS 2013 Videos from Channel 9

#######################################################################################################################                        
# Description:   Download MMS 2013 Channel 9 videos
# PowerShell version: 3                   
# Author(s):     Stefan Stranger (Microsoft)
#                Jamie Moyer (Microsoft          
# Example usage: Run Get-MMS2013Channel9Videos.ps1 -path c:\temp -verbose
#                Select using the Out-Gridview the videos you want to download and they are stored in your myvideos folder.
#                You can multiple select videos, holding the ctrl key.
# Disclamer:     This program source code is provided "AS IS" without warranty representation or condition of any kind
#                either express or implied, including but not limited to conditions or other terms of merchantability and/or
#                fitness for a particular purpose. The user assumes the entire risk as to the accuracy and the use of this
#                program code.
# Date:          04-13-2012                        
# Name:          Get-MMS2013Channel9Videos.ps1            
# Version:       v1.001 - 04-14-2012 - Stefan Stranger - initial release
# Version:       v1.005 - 04-29-2013 - Jamie Moyer, Stefan Stranger - added more robustness and HTML Report
########################################################################################################################
#requires -version 3.0
[CmdletBinding()]Param
(# Path where to store video's locally        [Parameter(Mandatory=$false,
                   Position=0)]$Path= [environment]::getfolderpath("myvideos") +"\MMS2013",
        [Parameter(Mandatory=$false,
                   Position=1)]$rssfeed="http://channel9.msdn.com/Events/MMS/2013/RSS"
    )function Get-NewFileName($name)
{
    Write-Verbose "Calling Get-NewFileName Function"$r=$Path+"\"+(($name-replace"[^\w\s\-]*") -replace"\s+") +".wmv";$r
}

Write-Verbose "Remove last slash if added using the downloaddirectory Parameter"if ($path.EndsWith("\")){$path=$path.Substring(0,$path.Length-1)}
write-verbose "Path is: $path"

Write-Verbose "Checking if Download directory $Path exists"if(!(test-path $Path-PathType Container))
{
    Write-Verbose "Creating $Path"
    New-Item -ItemType Directory $Path| Out-Null
}

Write-Verbose "Downloading RSS Feed Items from $rssfeed"$feeditems= Invoke-RestMethod $rssfeed
[array]$feeditemsWithDetails=$feeditems|
    select Title, Summary, Duration, Enclosure,creator |
        Add-Member -MemberType ScriptProperty -Name AlreadyDownloaded -Value {(test-path("$Path\$($this.enclosure.url.split('/')[6])"))} -PassThru -Force |
        Add-Member -MemberType ScriptProperty -Name Destination -Value {("$Path\$($this.enclosure.url.split('/')[6])")} -PassThru -Force |
        Add-Member -MemberType ScriptProperty -Name Source -Value {$this.enclosure.url} -PassThru -Force |
            select AlreadyDownloaded,Title, Summary, Duration, Enclosure,Source,Destination,creator | sort Title

Write-Verbose "Add all already downloaded items back to the list"$duplicateVideoNames=$feeditemsWithDetails|sort name| group destination | where-object {$_.Name -ne""-and$_.Count -gt1} |ForEach-Object {$_.Group}

Write-Verbose "Remove the posts with duplicate file names from the feeditemsSelected array"$feeditemsSelected=@($feeditemsSelected| Where-Object {$duplicateVideoNames-notcontains$_})

Write-Verbose "Change video names to filenames, check to see if they are downloaded already and added them back to the array with updated details"$duplicateVideoNames|foreach-object {$newDestination= Get-NewFileName $_.Title$_.Destination =$newDestination$_.AlreadyDownloaded = (Test-Path $newDestination)$feeditemsWithDetails+=$_
                                      }

Write-Verbose "Open Out-GridView to select vidoes to download"
[array]$feeditemsSelected=$feeditemsWithDetails| Out-GridView -PassThru |
    select AlreadyDownloaded,Title, Summary, Duration, Enclosure,Source,Destination

Write-Verbose "Downloading videos"$feeditemsSelected|Where-Object{!(Test-Path $_.Destination)} |
    select Source,Destination |
        Start-BitsTransfer -Priority Normal | Out-Null

Write-Verbose "Add all already downloaded items back to the list"$feeditemsWithDetails| where-object {$_.AlreadyDownloaded} |foreach-object {if(-not [bool]($feeditemsSelected| Select-String $_.Title -Quiet))
                                                {$feeditemsSelected+=$_
                                                }
                                           }

Write-Verbose "Create HTML Report"$feeditemsSelected| sort Name | Out-Null$html=$feeditemsSelected|?{Test-Path "$($_.Destination)"} |% {@"<H4><a href="$($_.Destination)">$($_.Title)</a></H4> <H5>Speaker(s): $($_.creator)</H5><H5>$($_.Summary)</H5>"@}

Write-Verbose "Open HTML Report"
ConvertTo-Html -Head "<h1>My Downloaded MMS Videos - $($feeditemsSelected.Count) Downloaded</h1>"-Body $html|
    Out-File$Path\MyMMSContent.html;start "$Path\MyMMSContent.html"