I was wondering what you guys think the best new feature in the CK is. Mine has to be OPALs. http://www.creationkit.com/images/2/2a/Tutorial-OPALs-2.jpg
Randomly select clutter from a list, randomly rotate, scale and sink items, and align to terrain! This means forests, dungeon clutter, rubble, and vegetation can be done in seconds!
The other thing I love is all the new lighting options, the ability to alter brightness and size without creating a new reference is especially useful, as are the different light types, and ability to customise flicker and pulse settings.

Newly-placed objects now appear at the cursor location, rather than six inches in front of the camera.

I'm a fan of the simple things.

Everything. I am completly addicted to it.

Do they? I never noticed this! O_o

This is what I love about the CK: so many tiny little things you may not even notice but are all incredibly useful when you need them.

'Properties' in Papyrus, it's just perfect for scripting new game mechanics.

I also love that all Actors can have a distant LOD model with a customizable switch distance. That will make simulating large battles in MERP a ton easier.

This. Oh how I hated that when using the Morrowind Construction Set, especially when it was a large object.

I also love the new dialogue system.

Well theres definately sum changes i dont like.

I dont like how you are unable to see a preview face of the NPC you are making. In the Oblivion CS, you could.

I like the new feature that causes the CS to randomly crash after about 15 minutes!

In all seriousness, there's too many nice new features to select only one.