forgive me if this is a question that has been asked many times before: I'm thinking about buying an ipod or iriver. Battery life is a concern. Why do some of these new players have battery lives twice as long as the ipod? Is apple going to do something about that? Many of these new players seem to weigh about as much (within an ounce or two) as the ipod but have significantly longer battery lives. I've read the ipodbatteryfaq.com page but it doesn't seem to address the basic issue of why the battery life is so much shorter than competing players in the first place, and if that's going to change anytime soon. Thanks.