FnbyDstryr over in the Forums noticed that the DS download demos from the Nintendo Channel have changed. The following titles have been added:
Brain Age
The Spiderwick Chronicles
Apollo Justice: Ace Attorney
Eco Creatures: Save the Forest
My Word Coach
Iron Man
All of the others, except for Flash Focus and Crosswords DS were removed from the original batch. Hopefully you were able to check out the awesome demo for Ninja Gaiden Dragon Sword before it disappeared.