Has anyone managed to do this on PC? I tried it but all I get is an arrow hitting the object I want to duplicate.

I've noticed this with some shall we say "particular" items on the 360 version. I believe that unique items, with unique id's, cannot be duplicated (Umbra for example) so make sure that you only try to duplicate items that are not unique.

I've also noticed that there are very rare cases when a normal, non-unique item doesn't duplicate. If you are unable to duplicate a normal item, get about 5 or more of the same object that won't duplicate and drop them all at the same time. If the items drop in different stacks (ex. you dropped 5 potions of respite and they came out in two stacks: one stack of 2 potions and one stack of 3 potions) then you need to try and duplicate each stack and find out which stack you are not able to duplicate and which stack you are able to duplicate. hope this helps!

What about a crumpled piece of paper??? Do they come in stacks?

err.. I wouldn't know the answer to that question because I've never seen any point in duplicating crumpled pieces of paper, but click on the link that says "ahh! it's raining daedra hearts!" in my siggy. It shows a guy (who I think is on PC) that duplicates a daedra heart.

I did it! It crashed my game, but I did it.

I would never use it for a cheat! No, just for fun.

stoooooopid question, but, how do you duplicate ?

OK, found it...