I've never done a clean install since I got my first Mac with Tiger. And from Tiger I upgraded to Leopard and upgraded Leopard to Snow Leopard. Now I'm getting occasional hangups and crashes (especially iMovie 09) so I want to do a clean install of SL. I have a clone of my SL partition on an external. So should I do a reinstall from the CD and just use Migration Assistant to transfer all data like Users, Apps, etc from the external SL clone to save me the trouble of reimporting my iphoto and iTunes libs and reinstalling apps? Or would tranferring those data make the reinstallation worthless?