
(well, maybe all of us except Aaron and Yeah)
You have to get yourself:
a) a recording device and/or a microphone. If your computer doesn't have an integrated microphone, you'll need one to record any external noise. There are cheap ones (from 2$ in the nearest supermarket or informatics store) and a wide range up to 50's and 100's $. If you only want to record sporadic readings or noises, get yourself one around the 8-15€, they perform very well and are easy to install and use. Oh, and make sure you have a line-in / microphone entry in your PC!! You can also (or on the other hand) use an external recorder and later transfer the audio file to the PC and then to your iPod.
b) a digital-sound recording program. You'll need a program which is able to understand and register the digital noise which is coming through the line-in/mic plug. There are several ones that, being free, perform really well (and are useful for other tasks too, mainly audio editing). My personal favorite is Nero WaveEdit (included in every Nero version), a powerful audio editing tool that is also able to easily record audio from an external source. But many many people use Audacity, which is more a recording program with added audio-editor features. Those two are the most common I think, but there are around 9843579834 programs more, all of them have ups and downs.
That's all
