For some reason people are surprised when I tell them this, so I decided I'd post it for all. This works for anything that has a headphone jack (e.g. laptop or desktop computer, cell phone, walkman, etc).
You just have to buy a $1 cable from a dollar store.
Plug one end into your ipod's earphone jack, the other end into your stereo's "aux in" or "video aux in" jacks (red and white).
Pictures 2 and 3
Then click your stereo buttons to put it into "aux mode" and press play on your ipod.