It could probably be done without too much work, however I think that it would be easier to just use wifi and something like synergy to share the input.
Thunar is a "nice file manager with a simple GUI." It is the default XFCE file mangager and therefore should be part of the default firmware image. I don't really like GUI file managers myself, but Thunar is probably my favorite of all of them. It already supports displaying ID3 tags (as well...