Loose Wire spots a potential problem for the future in the (apparently botched) iTunes 5.0 update - the lack of music in a physical form. Many of us are buying songs online now, and - once the roipping of our existing collection is done - just not buying cd's anymore. Well, what about hard drive crashes, malware, and botched updates? Loose Wire comments:

This kind of thing scares me. It scares me because we don’t yet grasp how fragile our music collection has become. Before we had a pile of CDs we could always go back to if our tapes, MP3s or burned CDs gave up the ghost. Nowadays our music collection may be just in the form of MP3 files, and what happens to them if something goes wrong? What happens if MP3 software (or a system crash, a hard drive error, or a stray catheter) corrupts your files, your tags, or your authorisation and proof of purchase? At what point do we say, “forget this, I’m not going to pay for anything that doesn’t come in some physical form I can stash on a shelf”?

That's a good question. I doubt you'll see mass moves in that direction, but I do expect to start seeing curmudgeons.