Hi. I've been working on a project called TagFS which is a FUSE filesystem that allows you to organize files with tags. It's useful if you want to have a really specific set of properties to wrangle in files, but still want to see all of the files with a subset of those properties.
If you'd like to try it download this:
https://github.com/mwatts15/TagFS/zipball/master
or clone the repository: git://github.com/mwatts15/TagFS.git
I'm also looking for people who can port to other operating systems. It should be pretty trivial since the underlying system is only based on glib so it's cross-platform.
Thanks.