ok guys, there are 2 ways to configure an ipod (i have a 30gb video)
1: as a player, can hotswap connection to pc set up to run with that particular ipod with no need to eject it, just yank out the usb cable when you feel like it.
But it doesn't show up as a disk its only visable to itunes.
2: set up as a disk: this is how i have mine set up, why? simple so i can just plug into any pc and it shows up as a disk that i can store any file type i need onto it, which is very useful for me at work as i'm a 3d artist, so i can move 3ds max files and textures around easily from work to home.
Now as a player functionality is not changed except when you plug it into your pc you have to eject it like you do with a usb key.
Also in this mode means you can use a small program called sharepod :
http://www.sturm.net.nz/website.php?Section=iPod+Programs&Page=SharePod this little application runs from your ipod and allows you to download music FROM your Ipod onto another computer ;-)
the ipod plays a number of different formats, including mp3, mp4 so you dont have to use the mp4a (think thats what it is off the top of my head) format if you dont want to. so you can play any mp3's you've downloaded, or change itunes (in its options) to convert any music you load on from cd's into mp3's as well.
Now the video, the ipod plays its own format so you have to convert you DVD, Quicktime Pro can convert into ipod format as can quite a few other programs, and the phono/video out put on the ipod can display it on a tv if needed, (though i haven't done this as i dont have the cable so couldn't say what it looks like)
ok thats all thats good stuff..
Now video: using the amazing loverly screen on the ipod video (it is nice) absolutely kills the battery and you only get a couple hours really before it needs charging,
Itrip (radio transmitter must have accessory): I had an itrip on my old ipod colour which pluged in the top the phono jack output, was really good, as you could turn the ipod volumn down and turn up the radio to reduce and radio crackle you got.
Itrip for Ipod video isn't as good, not so solid connection to the dock connector and as its working through the "line out" now you have no direct control over the volumn from the ipod which is a pain, i hope apple does a software change in the future to change this.
Hope this helps a bit.
I love my 30Gb Ipod Video