I've seen some people ask questions, specifically on how to do a fresh install. This video explains everything pretty well and walks you though the steps. Being newly converter from PC to mac I know I had questions that this answered for me. I hope this helps some of you.
http://media.libsyn.com/media/donmc/SCO0213-snowleopard-free-640x360-h264-Free-ipod.mov
http://media.libsyn.com/media/donmc/SCO0213-snowleopard-free-640x360-h264-Free-ipod.mov