I use my Ipod everywhere I go. I usually have my Ipod in my pocket when I head out of my apartment anytime of the day. I usually have it when I walk/bike to meet up with friends, and there is nothing better than having my Ipod with me to pass the time. I used my Ipod everyday of my trip! My Ipod was basically my best friend, because it was always with me whether I was traveling by myself or with a group of people. If I was by myself I would plug in my head phones and walk around a city while site seeing. It made the time fly by, and I never really felt lonely while I was walking around by myself.
While traveling, you will have a lot of down time either by yourself or with friends that you are hanging out with. There is nothing like a little bit of music that changes the mood of the people you are with. It is surprising to me how many people travel without a mp3 player or a CD player (if people are still using them?)
I bought Altec Lansing In Motion speakers about 3 years ago for $99. I think it is possibly the best purchase I have ever made. Speakers to an Ipod were an instant party during my travels. I would bring it with me to the beach, on the train, or just play it at the hostel when I was just hanging out. Not to mention that it charges your Ipod while it is playing. I didn't bring an Ipod charger so this was the only way that I could charge it. I have spilled drinks on it, had sand cover it, and dropped it many times and it is still playing! These speakers are also very small so they hardly take up any space in your bag.
While traveling make sure you are careful about showing it off though. Things do get stolen from your bags while in hostels or airports. The speakers I bought were so small that most of the time I kept them in my small back pack instead of my bigger backpack. You will also need a Currency Converter to use the plug in for electricity so that the plug fits the outlet depending on what country you are in.