Organizing

I am looking for a app that will take files in one folder and organize them into seperate folders, same amount in each folder.

Something like this...

http://bttb.sourceforge.net/index.html

I would use that program but it hasn't been updated in a while, doesn't work to well with dvd's.

Here is what I need to do. For example I have 20gb of Mp3's, I need to divide them into 5 groups, 4gb in each group so I can burn each group to dvd.

Thanks