i burn everything i keep to data DVDRs (Taiyo Yuden brand). if i want to listen to an audio cd, i have about a dozen HiSpeed CDRW discs (yes, the rewritable type) that i use for audio listening... they play in my home stereo and in my car cd player. when i want to listen to something else, i just re-use the discs. it's very efficient. i certainly don't want to have double as many discs as i already have.

i store my archived data discs in paper sleeves (not bought, just pieces of paper folded to completely cover the discs), in cardboard boxes. i know, i'm cheap like that. my money goes toward equipment and quality media, not toward storage devices.

well, that's how i do it. i'm sure there are plenty of other ways to do it as well... if you wanted, you could build a massive PC server/storage device with terrabytes of space. i'm sure it'd last at least a month or two.