classes,zip,jar,.war dependency analyzer ?

I'm on the lookout for a tool that tells me how many and which of the classes (even methods) i'm ACTUALLY using from the .jar/.war/.zip/classes on my classpath/classloader.

Tools like (genjar, pack, etc.) can generate the smallest possible .jar (derived on static analysis). I think the machinery in such a tool
is the exact same there is needed to visualize for me how big an idiot i've been by including a 1 meg. library, just for using one class or two.

It should not tell me EVERYTHING, it should just show me the top 10 "less-used" .jar/.zip/classes and let me explore from there ;)

Does anyone know of such a beast ?