To expand on the XM v. HD thing...

When I was out at NAB Radio in Seattle a couple years ago, they (the broadcasters) kept on and on about how HD was going to put them so far and above the satellite radio services. They acted like it was their magic bullet.

So last year at NAB Vegas, I stopped by the Ibiquity booth (they are the ones with the HD technology) and asked them about it - and wanted to know why the broadcasters thought that. Even THEY said it wasn't a magic bullet. Simply that it was one thing that could help.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist