I run a small record label and we have a bunch of audio files stored on Amazon's S3. We want them converted to MP3's with a standard bitrate. I read about the NYTimes converting all their PDF's using EC2 and since I'm a nerdy web programmer, I'm intrigued. Instead of downloading all the files and converting them by hand, I'm wondering what it takes to set up an EC2 instance and get it set up to convert files? I want to be able to control it from my web server with PHP, so is the approach to create a virtual LAMP stack and install the LAME encoder?