I have so far resisted an upgrade (?) to OS Lion because, based on the experience/reactions of others, I have found no compelling reason to do so---I'm fine with Snow Leopard. However, I see that Apple recently offered updates to iMovie and iPhono which require that one be running Lion. Is it time to take the plunge? I assume that this practice will become the norm, if it's not already. Thanks for any advice/input.