Put simply, he states, 97% of music is sold DRM free. Only 3% of music on iPods (the only source for which he has accurate data) is bought from the iTunes store.
In an interesting piece he explains why (and how) Apple has evolved the iPod/iTunes success and dissects the reasons why DRM is held as necessary by the major labels.
That figure, 97% is huge and to me represents a reasonable assessment of those of us that are lucky enough to be early adopters in numerical terms. Makes me think that the old school (major labels) really must believe that we are influential. As Jobs suggests, innovation is what it’s all about and protecting crap systems is an expensive waste of time that the labels must scrap if they want us, the early adopters to give them any attention down the line. There’s a big battle to be fought yet however. Openness though, it’s a recurring theme.