yes limewire will let you send files over the same network and it even plugs into itunes so if you have limewire and itunes on at the same time you can listen to the other computers songs. there are also programs like mytunes or ourtunes (something like that search around you can find them) that let you download peoples songs from itunes if the computers are on the same network (college people use it all the time cuz the networks are massive and it is harder to track than regular p2p). About the dvd i dont really know much about burning on macs but if they make a mac version of nero i would try that and i think there is a setting that does not verify dvd content. But if you are getting an error that says the files are not verified than one of the files is probably corrupted.