I have real player (thing real player sp) and it has a built in downloader that will let u download YouTube videos and convert them for iPod or any other device. App is free of course. Also if ur iPod is a touch then there are two apps u can use natively available through cydia, one is called yourtube and other is mxtube. They both allow u to download videos directly from YouTube to device. iPod has to be jailbroken of course which is pretty easy. Hope this helps!