Here's a Ruby script that I'm going to use to slap on start and end music for my podcasts:

Dir.foreach("../X30 Storage Card") {|filename|

  if filename =~ /Podcast.*\.mp3/

    File.stat("..\\X30 Storage Card\\#{filename}").mtime.to_s =~ /\w+ (\w+) (\d+) (\d+):(\d+):\d+.* (\d+)/

    puts `copy PodcastStart.mp3 /b + "..\\X30 Storage Card\\#{filename}" /b + PodcastEnd.mp3 /b "..\\Podcasts\\#{$2}-#{$1}-#{$5} #{$3}-#{$4}.mp3"`

  end

}