@esoteric:

- Repository for universal meta/data storage? (for files, for application files, application data, managed, unmanaged)
- Windows Search uses Repository?

How would such a beast help customers? 

Remember that the Windows team no longer builds features for the sake of building features (or because the feature is "cool").  That practice ended with Alpha Longhorn.  Instead every new Windows feature needs to be directed at a particular end-user scenario.  What end-user scenario is enabled by such a universal storage system (that's not already implemented)?

If you're going to speculate about Windows features, you should keep that in mind.  Start with the end-user scenario and go from there, don't start with a feature and say "man, that would be cool".