Will the PC ipod work on BOTH a pc and a mac? I have both and that would be a really great feature. Also what does the PC bundle of the ipod lose over the Mac version (I noticed it gains the musicmatch software and what I believe is an ilink to firewire converter)? Also which ipod would you recommend the 10gb (I believe its a little lighter and smaller) or the 20gb? One last thing, how many years can I expect the battery to last without getting ruined (ie. memory effect etc..), and what kind of maintnance should I expect to do on ipod?