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My favourite was Zune, but I don't remember when they bundled it. http://cybernetnews.com/wp-content/uploads/2006/11/ZuneTheme...

They never did - you got it if you bought a Zune.

There were additional (nicer than Luna) official themes with XP Tablet Edition, and XP Embedded as well.

There was XP Media Centre Edition which had it as default theme

You could also download it for free from microsoft.com. It's still there: http://download.microsoft.com/download/e/a/9/ea9af5ae-b48e-4...