I have quite a lot of my MP3s on CDs, but that's because my old PC had 300 MB of free space at most (well, I later added my friend's 4 GB HD) - so I had no choice but to burn everything I downloaded. ^^ Now I keep everything on my 320 GB HD and I'm slowly (but surely) sorting and renaming them, adding ID3 tags and Replay Gain and downloading covers. When I'm done, I'll burn it all to DVDs. Currently I've gone from A to Slayer. XD