I'm pretty disappointed that iPods don't officially support Ogg Vorbis format, as that's the most efficient method of music compression currently in existence that I'm aware of, and it's also the only lossy compression method that doesn't have those annoying gaps at the beginning and end of music files that cause gaps between tracks that should play continuously. (Apparently, some hackers have come up with a workaround that allows you to play Ogg files on your iPod, but using it will void your warranty).

I've got a 40GB iPod that was given to me as a gift over a year ago, and I like it quite a bit, but I'm finding that I'm frequently having to delete files off of it now because I have about 9,000 of them. I've already converted around ninety percent of my library to AAC format, which is more space-efficient than MP3 format, but I've still had to delete files since then. Now I kind of wish I had a 60GB player, and if I had a larger budget I'd probably consider getting one. Of course, most people are unlikely to spend as much of their time downloading music as I do, so this problem probably won't apply to most people in this thread.