(http://up.vatandownload.com/images/h590cas2pfpfwtvmiwj6.jpg)
FolderPie will help you collect each folder actual size on your disk space. And present in Pie view for easy understanding at glance.
Free app without annoying advertisements
(http://p.d.ovi.com/p/g/store/9892625/FolderPie_Screen0-192x192.jpg?q=ZLdZ5Q*8yBt9EYFzv6WxZYYBFxE0DsJ2&c=ovi_store)
Nokia Store (http://store.ovi.com/content/277078/)