We pack a small power strip with a USB port on it, because we have a large number of electronics we like to keep charged up (iPads/Nooks for ebooks, iPhone/iPod, cameras, etc).
We do pack a shoe organizer, but it hangs on the hook outside the bathroom and gets used for quick access to stuff we use a lot - sunglasses, goggles, sunscreen, navigators, pens/hilighters, etc. Otherwise they tend to get lost on the desk!
This trip we're also bringing a shoe organizer for (gasp) shoes! We only take 3 pairs each, but that's 9 pairs among the 3 of us, and they've always gotten jumbled in the bottom of the closet. I'm hoping hanging this in the closet will help keep us better organized.
We have in the past packed a tap light for the bathroom at night, but we usually have inside cabins. It's not on our list for our next cruise.
DH always packs a flashlight. I keep telling him we're not cruising Carnival, but I think he just wants to be prepared
I really can't think of anything we don't use. If you're a DVC member or have cruised before, don't bother with a lanyard - you'll get one. Or 2. Or 6. We usually end up with at least 6 by the end of a cruise between
Castaway Club and DVC!