It seems that Europe is now cracking down on iPods to regulate their volume. They are setting out regulations to govern how loud iPods can be, and they will require a much lower volume than before. This is a new policy that will require all iPods to have a default maximum volume that does not exceed 80 dB. This is supposed to be a very loud sound, and anything that is over that can be dangerous and damaging to the hearing.
Many iPods currently have the potential to go from 115 to 125 dB. Just to put it in perspective, the noise that you would hear on a busy street is 80 dB. 120 to 130 dB is equivalent to the sound of an airplane taking off, which could severely damage your hearing if you listen to an iPod at that volume on a regular basis. This does not mean that you will not be able to exceed that volume restriction, but it just means that the manufacturers will have to create default volumes on the devices to keep the user's hearing from being damaged. However, customers also have the option to disable that default and turn up their volume once again. At your own risk!