LinkLens is a web 2.0 app (if that actually means anything). I guess I'm saying it uses ajax to let you do drag and drop in a web browser. However there has been lots of work in the past on "semantic filesystems" and a couple of years back I wrote a shell script that simulates the same sort of behaviour on the unix command line:
However I didn't really work out a good way to tell anyone about it (till now - thanks blogger) and my ideas have been superseded by events on the ground. For example someone built a filesystem that supports this kind of associativity directly:
I really want to write an academic paper that pulls all this stuff together ...