Here's another more pocket sized one than that(I made this with some styrofoam to look cool).
Its always nice to have something louder than your headphones and better quality than your lame Ipod speakers. And why would you pay $50 for mini Ihome speakers when you can do it yourself for $5! This gives you better sound quality and awesome pocket sized music!
Step 1: Make it
Go to Re-store or some place that you can get used electronics for cheap and bring your Ipod.