I'm wondering whether or not to do a fresh Snow Leopard install (ie, back up everything, wipe my Mac, reinstall Leopard, and then install SL on top of the fresh install). I've heard that it can help boost speed - is this true? Also, if I have everything backed up via Time Machine, will everything (including all my apps, etc) be brought back down through the Migration Assistant in Snow Leopard? Or will I encounter problems? Thanks!