Colorized capture of console screen in HTML and RTF – http://blogs.msdn.com/b/powershell/archive/2009/01/11/colorized-capture-of-console-screen-in-html-and-rtf.aspx

ConsoleAsHtml.ps1

function Get-ConsoleAsHTML
{
  [CmdletBinding()]
  param (
    
  )
  
  # 
  # The script captures console screen buffer up to the current cursor position and returns it in HTML format. 
  # 
  # Returns: UTF8-encoded string. 
  # 
  # Example: 
  # 
  # $htmlFileName = "$env:temp\ConsoleBuffer.html" 
  # .\Get-ConsoleAsHtml | out-file $htmlFileName -encoding UTF8 
  # $null = [System.Diagnostics.Process]::Start("$htmlFileName") 
  # 

  begin
  {
    # Check the host name and exit if the host is not the Windows PowerShell console host.
    if ($host.Name -ne 'ConsoleHost') 
    { 
      Write-Host -ForegroundColor Red "This script runs only in the console host. You cannot run this script in $($host.Name)." 
      exit -1 
    } 

    # The Windows PowerShell console host redefines DarkYellow and DarkMagenta colors and uses them as defaults. 
    # The redefined colors do not correspond to the color names used in HTML, so they need to be mapped to digital color codes. 
    # 
    function Set-NormalizeHtmlColor ($color) 
    { 
      if ($color -eq "DarkYellow") { $color = "#eeedf0" } 
      if ($color -eq "DarkMagenta") { $color = "#012456" } 
      return $color 
    } 

    # Create an HTML span from text using the named console colors. 
    # 
    function Get-HtmlSpan ($text, $forecolor = "DarkYellow", $backcolor = "DarkMagenta") 
    { 
      $forecolor = Set-NormalizeHtmlColor $forecolor 
      $backcolor = Set-NormalizeHtmlColor $backcolor 

      # You can also add font-weight:bold tag here if you want a bold font in output. 
      return "<span style='font-family:Courier New;color:$forecolor;background:$backcolor'>$text</span>" 
    } 

    # Generate an HTML span and append it to HTML string builder 
    # 
    function Set-HtmlSpan 
    { 
      $spanText = $spanBuilder.ToString() 
      $spanHtml = Get-HtmlSpan $spanText $currentForegroundColor $currentBackgroundColor 
      $null = $htmlBuilder.Append($spanHtml) 
    } 

    # Append line break to HTML builder 
    # 
    function Set-HtmlBreak 
    { 
      $null = $htmlBuilder.Append("<br>") 
    } 
  }
  process
  {
    # Initialize the HTML string builder. 
    $htmlBuilder = New-Object system.text.stringbuilder 
    $null = $htmlBuilder.Append("<pre style='MARGIN: 0in 10pt 0in;line-height:normal';font-size:10pt>") 

    # Grab the console screen buffer contents using the Host console API. 
    $bufferWidth = $host.ui.rawui.BufferSize.Width 
    $bufferHeight = $host.ui.rawui.CursorPosition.Y 
    $rec = New-Object System.Management.Automation.Host.Rectangle 0, 0, ($bufferWidth - 1), $bufferHeight 
    $buffer = $host.ui.rawui.GetBufferContents($rec) 

    # Iterate through the lines in the console buffer. 
    for ($i = 0; $i -lt $bufferHeight; $i++) 
    { 
      $spanBuilder = New-Object system.text.stringbuilder 

      # Track the colors to identify spans of text with the same formatting. 
      $currentForegroundColor = $buffer[$i, 0].ForegroundColor 
      $currentBackgroundColor = $buffer[$i, 0].BackgroundColor 

      for ($j = 0; $j -lt $bufferWidth; $j++) 
      { 
        $cell = $buffer[$i, $j] 

        # If the colors change, generate an HTML span and append it to the HTML string builder. 
        if (($cell.ForegroundColor -ne $currentForegroundColor) -or ($cell.BackgroundColor -ne $currentBackgroundColor)) 
        { 
          Set-HtmlSpan 

          # Reset the span builder and colors. 
          $spanBuilder = New-Object system.text.stringbuilder 
          $currentForegroundColor = $cell.ForegroundColor 
          $currentBackgroundColor = $cell.BackgroundColor 
        } 

        # Substitute characters which have special meaning in HTML. 
        switch ($cell.Character) 
        { 
          '>' { $htmlChar = '&gt;' } 
          '<' { $htmlChar = '&lt;' } 
          '&' { $htmlChar = '&amp;' } 
          default 
          { 
            $htmlChar = $cell.Character 
          } 
        } 

        $null = $spanBuilder.Append($htmlChar) 
      } 

      Set-HtmlSpan 
      Set-HtmlBreak 
    } 

    # Append HTML ending tag. 
    $null = $htmlBuilder.Append("</pre>") 

    return $htmlBuilder.ToString()
  }
}
Get-ConsoleAsHTML