Just got this idea in my mind:
What would you say about loseless data recovery?
Idea is simple: make a loseless file and add some data (separate file for more compatibility?) to recover lost data on CD damage. The same, as in RAR algorithm. I'm sure, that 5-10% of additional data won't spoil anything, but it might be reallt umportant. For example, I'd not liked to lose data on any of my numerous (tens of them already) MP3/OGG/FLAC/MPC CDs.
What do you think?