Well, if you want simple stereo (which is all that's supported at this time), just get a Y-adaptor with stereo minijack on one end, and component audio jacks on the other. Go ask around at Radioshack, describe it and they'll know what to give you. You plug it into your line output (or headphones, since you don't have line-- just set the volume somewhat low i think) and plug the component (also known as RCA-style) jacks into your stereo. If you want, you can get extension cables for either connection... i extend the minijack side whenever i'm doing it, but it's up to you. It's easier to get female-female minijack adaptors than it is f-f component adaptors.
I simply went ahead and bought an iPod, used a y-adaptor, works very nicely with my stereo. but i don't have a laptop, so that's more convenient.
pnw