I have every Led Zeppelin song on CD. Unfortunately, I have the box set that came out in 1990, which was basically a four-disc greatest hits compilation, and its 1993 follow up, which contained all the songs that weren't on the first set. This means that if I want to listen to, say, Houses of the Holy, I either have to shuffle through all six discs looking for the eight cuts that originally made up that album, or I start shuffling through the six discs and then realize it's too much work and I quit.
This is probelamtic for a Rock Snob such as myself because Zep's albums were meant to be listened to as such -- they're one of the few bands whose albums were albums and not two or three great songs with seven or eight tracks of filler spread out over an LP.
Since I got the Mac and since it came with iTunes installed, I knew I could rip all the tracks and then listen to the albums in their intended sequence again. And since I have no life, I decided to start that process this afternoon. I'll probably burn two albums to one CD for economy's sake, but this project was long overdue.