Best Way to manage speech files?

Just to gather some ideas, how are you handling your speech files, in terms of naming, filing etc..

My folder structure is as follows...

root
 data
  characters
  interfaces
  ... etc
  sounds
   bgm
   sfx
   speech
    scene_name
     en   
      i_item_w_object|item|character
      u_object
      x_object
     de
    general

i = use item on object or character

u = use or interact with object or character

x = examine object or character

dialog stuff is a bit more complicated to name. I think some kind of ID would be a good idea. Maybe something like 0101a - dialog number, level number, option a. I've not decided on how to name them yet as I don't really use dialogs much.