Detecting changes to files for sync

It would be very useful if positron could detect file changes.  Often times I will edit ID3 tags 
between syncs (change genre, etc.) and would like those changes to appear on the neuros.  This 
could be accomplished either by naively comparing the mtimes of the files, or even better by 
using an rsync type algorithm for the sync (perhaps using pysync 
http://freshmeat.net/projects/pysync/?topic_id=251%2C71%2C42%2C912 ).