FUSE
http://fuse.sourceforge.net
2.2_preX
It follows the sweet concept of "If you can do it in userspace, don't put in the kernel" and I really support and love that concept (udev anyone?).
With FUSE it is possible to implement a fully functional filesystem in a userspace program. Features include:
Everything and I can't wait until someone (maybe me?) impl a nice subversion versioning filesystem.
5 stars
A must try for everyone that wants to get rid of using lufs/shfs or fish (kde) in favor of something simpler and more flexable.

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