It would be a nice addition to be able to see which files have already been viewed. In Tversity there is a difference in color of the font for watched files.
I agree; It can be tough to figure out what has and has not been watched in a TV series folder for example my dvr-ms files have very long file names and you have to pay attention or you play the same show again.
So don't write it here but to PS3(Sony) support. PS3 can't use another color in browser list!!!!
But don't try it, it is not in DNLA specs = unpossible...