When I carried home my new space-grey 1.3GHz MacBook yesterday I had already decided to do a complete, from-scratch installation. I did this with the iMac earlier in the year and haven't regretted the two or three days of fiddling to get things back to the way I like them. Over the past six months I've had repeated problems with Migration Assistant on a variety of computers (mainly friends' new toys). MA would run for several hours and then stop for no obvious reason. In the end, a reinstallation was the best choice. This came as a surprise because in the past MA has been rock solid.