spotlight replacing the finder might sound silly, but a move in that direction isn't too unlikely. organising files using metadata is pretty damn cool, and i think something like that could eventually replace the whole "folder" thing, which is more or less taken directly from physical filing systems. the whole digitisation of everything leaves room for new/different/experimental ways of organising and accessing files on your computer, and i think it sort of sucks that no-one's really pursued it in mainstream OSs.
