I said in my previous post that I personally find music very helpful to enhance learning. I use my iPod nano.
I prefer playing MP3 rather than from CD in class because I can play many different songs with change for another CD. And I prefer iPod rather than other MP3 player or straight from the laptop. I used to play it from my laptop, but the trouble is that I cannot manage the music as I have my slide on!! I can however do so with the iPod. In addition, compared to other MP3 player, I can control my iPod nano very easily, most of time by just one click!! Such feature is absolutely necessary when you are in the class, since there are already so many things for you to attend to.
One additional plus – you can use iPod as a back up (to your laptop) to play your slides. Very simple – just save your slides as JPEG files and transfer to your iPod. Of course, you will need a iPod AV connection kit, which is available in the Apple store. I learnt this from presentationzen.com.