I know I'm being a little proactive here, since it'll be months before real users have WP7 devices in their hot little hands, but...
If you're a Zune or ZuneHD user, you probably already have had this problem, and WP7 folks will as well.
The problem happens when you're loading an old CD, or the tracks from an old LP. I have a USB turntable and have been ripping some of my jazz LPs from the 60s and the Zune doesn't know where to find this stuff.
In my LP case, the Zune player ends up just shunting my content to an unknown location. But sometimes, it will mixup disc 1 and disc 2 information.
I have an easy solution to repair these situations.
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