I'm carrying around 30 lbs. of quest items I cannot drop. I guess I would also be content if they didn't weigh anything.

They don't.

Plenty do. I have bottles of Alto wine, .5lb each, like 9 Giants Toes, 1lb each, and several of the Claws for those dungeons, again .5lb each. I would like a mod that makes all quest items weightless too... I'm guessing alot of these are quest items on accident? I have built up like 15-25 pounds (AT LEAST) of quest items as well.

Being able to drop quest items could possibly break the game, which is why they are currently undroppable. It could result in getting an item to unlock a specific sequence, dropping the item before the sequence is triggered could allow you to glitch yourself a powerful item you should have gotten rid of, or start a sequence that endlessly loops because you impossibly don't have the item required to finish it (which was also require to initiate the sequence). It would be up to you, really not to break your game. I'd rather see quest items broken down into essential and non-essential. That way I can drop items I don't need that won't break the game for not having them.

I thought sure you were crazy, since several of the items list a weight. However, I dropped everything possible from my inventory. The quest items remained and even though they show a weight for most of the them, my carried weight was 0/300.

Thanks.

I'd still like to drop them, since in some cases they are bugged since the quest is complete and they are no longer quest items, or I have no intention in completing the quest.

That'll certainly one of the first things I mod for me when the editor will be out. I do not like having that extra weight of "undroppable" items in my inventory. I want to store those in a chest as I find them. I'd add the "(Quest)" mention in the item's name to they can be easily identified since some quest items have the same name as regular items.

Some unknown quest possible spoiler:

A mod to make quest items weightless would be awesome.

If it's in the game design that we are destined to forever carry these things around, the least they could do is make them weightless.

I'm picturing a DragonScript/SKSE thingy where you hit a hotkey and quest items in your inventory are assigned a ZERO weight.

^ They are weightless.

If the mod could label them as a quest item but make them drop-able that'd be nice, then I could just dump them in my house until I found out what quest they belong too.

The items have weight set in their base forms so it shows up in the menu, but it doesn't count against your carrying capacity. Not sure why they didn't just set the weights to zero to make it obvious.

Edit: oh right, there are quest items that are unflagged after the quest is completed that remain in your inventory.

Glad I read this thread.
So it's established that even though Quest items show a weight, it doesn't affect your carry weight.

NICE.

Indeed. This is a relief. Though it is broken that they are quest items when they shouldn't be, it is great to hear they aren't weighing me down. Thanks guys!

I did that quest here is what you do with it.

SetQuestObject (Object ID here) 0

That makes them droppable in Oblivion I think. Obviously 1 will make them quest items again.

And probably best to try not to lose them if you put them down.

A better mod will be the ability to drop them (in a house you own) until you need them later. Keep them in a locked chest or something.
If the quest isn't active then the item should be set to "0" (dropable). If you make the quest active and you don't have said item then a reminder should pop up so you don't travel to your destination without it.
You wouldn't want to get there and realize you left it home.