Nodescope

See whats using up all your storage space!Nodescope shows a tree of boces representing your USB storages folder structure, where each boxs color and size represents the disk usage of that file or directory.
The contents of each folder are shown underneath the box for that folder, so you can drill down into the hierarchy.Tap on a box to zoom to that box, or swipe and pinch to navigate around.
The children of each folder are sorted biggest to smallest, left to right.
Children that arent big enough to show are grouped together into a grey box - zoom in or tap to see them.This app is also available for Windows: http://karlhendrikse.co.nz/projects.htm#nodescope.
The framework supports various other kinds of trees (I use it to investigate the number of lines in trees of source code).
Im interested to hear if theres some other kind of tree you think would be cool to visualise like this.