This is cool, From xda's Thanks go to (APBilbo) give it a look and try..
Hope it Helps. Thanks T M Z
http://forum.xda-developers.com/showthread.php?t=479905
Here you have a little app I've developed

.... It shows you graphically how your storage space is beeing used displaying a circular chart so you can eassily locate which folders are taking more storage. You can navigate through all of your folders and analize each one in detail or exclude them from the report. Eassy and simple!!
See details on my web
http://www.throttlelauncher.com/
This app concept is based on the clasic FileLight linux app. All credits for the idea go for them (or who ever they take the idea from...)
Compatible with all mobile devices (WM5 and WM6) and all screen resolutions...
There are probably other similar tools out there.... simply I found it eassier to make it myself than finding them out LOL!!!
Any constructive feedback is really wellcome!
Hope you like it and you find it usefull!!
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P.S. Also works on your desktop