I would love to see this too. Mainly my interest is for the Nokia closed source applications (like File Manager, Contacts, Media Player and the browser UI) to be open-sourced, so that the community can fix bugs/add features as desired. However, I see very little chance of this happening.

MeeGo will apparently have open-source "reference" implementation of the above applications, which is a good step forward, although Nokia may still be coding up their own closed-source alternatives for their MeeGo devices. Without knowing the difference in capabilities between the open-source and closed-source apps, it is difficult to know how much of a problem this will be in the future.