I'm confused by what you guys deem "self working." To me it means the effect solves itself without any additional help from the magician. Basically, "no skill needed" to perform the effect.
-Out of This World is not an
impromptu, self working effect. It has a set-up, and that set-up involves the entire deck of cards. If you don't use a set-up you need to do some sleight of hand to separate the cards during performance. If you have it set-up, though, from that point it's the best self-working card effect out there.
-Diplopia is not self working either. There are a couple moves, and quite a bit of calculating going on. This effect takes quite a bit of practice, and if performed right is anything but self-working. Also, as Jassu indicated in his criteria of the thread, the effect is not completely handled by the spectator. The magician is doing some sneaky stuff.
-Search & Destroy is not self-working either. There is a sleight and a "hidden move" in the effect. Also, audience management is important to keep the effect from being discovered. Not self-working. Also not completely handled by the spectator. The magician needs to handle the deck three times for the effect to work.
JASSU:
If you want to learn some strong self-working card effects, the very best source is "The World's Best Collection of Easy-To-Do Impromptu Card Magic" by Aldo Columbini. Not sure if the book is still in print but it is excellent. I know he did a DVD series not too long ago based on the book.
My favorite self-working effect is "Phone," Paul Vigil's take on an Eddie Fields effect. Paul Vigil teaches it on the "Prime Cut" DVD. Excellent effect, and without a doubt the best impromptu card effect you can do over the phone with someone. They think of a card and shuffle the deck and, even though they never tell you what card they are thinking of, you are able to discern their thought of card and name it. Seems totally impossible, and it's very strong.
You can see "Phone" performed by Paul Vigil
here. It starts at the 1:00 mark.