MacFuse

My colleague Robert Brewer also told me about MacFuse. I was going to post in a comment, but the links there are not auto-hyper (maybe there's a setting I can change for that), so for the moment I'll put this in a main post:


You might also be interested in MacFUSE, the Mac port of the File-system in USErspace project. It allows one to write filesystems pretty easily (though with lower performance than native file systems, naturally).

http://code.google.com/p/macfuse

One of the demos is a Spotlight file system, which in combination with the tagging using Spotlight comments could presumably create a tagged filesystem in Mac OS X:

http://googlemac.blogspot.com/2007/01/spotlight-file-system-for-macfuse.html