• All the iOS devices — iPhone, iPod touch and iPad, are built around Cocoa Touch.
• Snow Leopard brought 64-bit support to the Mac mainstream for Cocoa applications. Carbon applications are clearly on the way out and have been since the release of Leopard in 2007.
• The third major release of iTunes since Leopard came out is still Carbon and still only 32-bit. (Perhaps an even greater irony is that there is a 64-bit Windows version of iTunes.)

Is this a bit of a nitpick? Probably. Does it really matter what the framework underneath iTunes is if it is being improved? Possibly not. Is iTunes a huge, vital part of Apple’s iPod/iPhone/iTunes Store infrastructure that they are naturally unwilling to make huge changes to? Absolutely.

But I really, really wanted iTunes 10 to be ‘iTunes X’ — not just another major release with some new features, but a drastic rewrite of the application (for the Mac anyway) in Cocoa. The app’s performance has been improved with recent versions, but iTunes is still the one application that ships with Macs that feels out of place — the interface is jarring and not fluid, the app frequently hangs for several seconds for no reason and there is ancient UI debris hanging around. (Those first two might be better with this release, I don’t know, but the Mac OS 9-style context menu cursor lives on.)

Ah well, maybe iTunes 11? 🙁