We posted a disassembly pic of the new Mac Mini the other day and today iFixit takes it apart and gives you step-by-step instructions so you can do the same. They are also offering an upgarde kit for $250 which gives you 1TB of storage by installing two 2.5, 500GB drives and removing the optical drive. See their site for all the details and be sure to checkout the upgrade kit should you need such an upgrade yourself.
