Geez!! I didn't realize Explorer will show the total time of selected media files if you have Details Pane selected in Layout(or at least it does on both my Vista PCs but I have MediaInfo installed on each so I'm not sure who is doing what.)
Still, it's nice to have this utility to drag stuff from various folders etc..
edit: btw I noticed that Windows, for some reason, doesn't(at least on my systems) do total play times for .wmv files. If this is because I auto kill WMP I don't know.. but in any case it's good to have PlayTime on.