Hi i have small proposal for improvements your program.
....Speed and simplicity is an important feature of many programs, so i think its will be better if you add in your program this function: http://i.imgur.com/E9egrlc.png

how will work: just click to some small "+" next to "folder" and automatic and quickly i will could add thing to folders, and dont need "intricately" click to folders and then click down to "Add new"...