AVFS - A Virtual File System (Score 2, Interesting)

Have a look at this for a userspace filesystem http://www.inf.bme.hu/~mszeredi/avfs/

There are a debian package called fuse-source and fuse-utils. I.e. use all these nice kio plugins on filesystem level.

Just add

deb http://www.kalyxo.org/debian/ unstable main
deb-src http://www.kalyxo.org/debian/ unstable main

to your /etc/apt/sources.list

apt-get update
apt-get fuse-source fuse-utils

Actually, I didn't test that yet. Someone else?