Ernest Miller on Apple & Microsoft DRM (Digital Restrictions Management) Lock-in:

Look at it from Microsoft’s point of view. Every song you purchase from iTunes with Apple’s proprietary, DMCA-protected DRM is one more bit of lock-in to Apple. When you’ve got a hundred or two hundred or more of your favorite (let’s face it, you buy your favorites first) songs in iTunes format, you’ve got some significant lock-in in the form of very high switching costs. Just the way Steve Jobs likes it.

And that lock-in is growing at a rate of millions of songs every month.

Very useful post, Ernie!