Well I found my old Creative Zen Vision: M lying around today, and its screen is completely broken so after some quick googling and a few tutorials later... I have a nice HDD in my possession:
Hitachi Travelstar 30 GB 4200rpm
Model Number: HTC426030G5CE00
So now what do I do? The thing has a zif connector, not something I'm at all familiar with but apparently I can get an adapter to USB from a hard disk enclosure.
I've thought about putting it inside an Asus EEE, these drives are obviously fairly rugged and it's also small enough that with some slight modification to the chassis I can get one inside...
Lastly, does anyone have any data on the read/write speeds for these things? If it's nippy enough I might use it as an external hard drive. Or as the basis for some sort of mod to make an incredibly small PC in some sort of household object.