Memory usage app that shows how much space is taken up by each component?

[orlandojumpoff]

I remember seeing an app on here a while ago that displays memory usage, as in shows an overview of the different parts of your phone and how much memory they take up. It sorta looks like a big puzzle because it shows in detail which programs are the biggest/smallest. Can anyone point me to a post on it? I can't remember the name... or something similar would be nice too.