Hi, I don't have an ipod. However, I am currently doing the love story video for sunshinebride. We ran into great problem with songs downloaded from itune.
As it has a DRM protection built in the songs. I cannot play the songs on my PC and we cannot convert them into other commonly used format such as mp3 or wma. I would highly discourage anyone

buying songs for wedding at itune. You may want the flexibility and play the songs on other devices other than ipod. Getting the CD and do your own conversion into MP3 is still the best way for wedding.
BTW, always have a plan B for weddings. ipods do break down

!!