^ yeah just download from limewire or something. theres one site a friend showed me, i forget it but ill try to remember it. then download a video converter if you need one. the zune software only plays .wmv, and .mp4 i believe. i downloaded something like Freez' converter or something because i had a lot of .AVI's. then just make sure your converted video is in the folder your zune software looks in for new media...
ive heard you can get lots of hidden viruses, and i have no idea how to, i tried once, and failed misaribly. i dont wanna use limewire, cause its fucked up our previous comp.
Torrents are by far one of the safest choices for downloading stuff off the internet. You should definitely stay away from limewire if you don't know how to safely get stuff from it. For a guide on how to set up bit torrent look here http://utorrent.com/beginners-guide.php
Generally with torrents you can see where others have left comments or verified that the torrent is virus free. Just keep your head about you and you can safely get gigs upon gigs of media. Let me know if you need any more help.