Great app, especially for those who don't want to spend money on something like Irivium [Huggles his discount.] which has drag and drop capabilities. Its also nice and portable this would even be useful for editing a playlist when I am not at home with Irivium at my beck and call. I'll definetly try it when school starts back up again. My only real concern is that it requires .net. [Windows.] Maybe you or someone else could port it so it becomes OS independant. I also see you put out the source code, hopefully if you can't do it someone else will.
