Really, sometimes when I've picked up too much random stuff by accident I'd like to know which items are the heaviest so I can drop those

If you have it for PC, I'm sure a mod will be added for stuff like that.

In Oblivion you could click the icons above the actual numeric value of an item, like its wieght or price, and it would organize them, hightest to lowest or vise versa. No idea if its the same in Skyrim.