I am going to start replacing the OP daily, it appears that it is the only one people are reading.
Here is the one from day 1 posted here to start the refreshing of OP on a daily basis and not lose this post:
Here is a platforming/puzzle game that could be done with Natal. It would be Lemmings esque(creatures constantly walk forward unless something interacts with them), where your body and perhaps voice help them to navigate the environment.
For example, if there is a hole that they need to cross, you can either place your hand in a position that the creatures can walk across(rotated in any direction, slanted upwards to go up, downwards to help them go down), or you could do it like an elevator, where they walk on your hand and you move it upwards(but not too fast, otherwise they might leave your hand when your movement stops, due to a nice physics engine :) ) If it is a long way up, you might have to use your other hand to stop them from going forward, otherwise they will walk off your hand. Or perhaps cup them in your hand. You could even use your entire arm if you needed more space to carry more creatures across.
You might could catapult them, but doing it with too much force would kill them. If there is a catapult on the map, you could pick up one of your creatures and place it in it, and them you would have to operate the machine with your hands. Pull a lever, pull back something, etc.
You could pick one up and then use verbal commands to change him into a different job, or give some sort of different directions to execute.
You could defend the creatures from enemies by grabbing the enemies and killing them. Or protect them from falling objects by placing your arm over them. Or commanding your creatures where to attack by pointing. Or verbally saying duck so that all of your creatures duck or defend from whatever is coming. Or pickup up a piece of the environment, such as a rock wall and using it to protect them and swing off enemies.
You could grab the environment in certain circumstances and alter it to solve puzzles and help your creatures escape. Destroy blocks in the way, use keys, give your creatures items from the environment, throw things. It could become trying to multitask getting your creatures out safely and altering the environment as necessary.
It could be mapped to where your body position determines the screen's X position. For example, you move left and the screen moves left, you move right and the screen moves right. This could be done with the hands if people do not want to stand. But standing gives an advantage of being able to use your hands while scrolling the screen.
This idea could be taken a long way I think and provides a different experience from anything out there. Almost as if your actual body was a piece of the environment, used for creature to crawl over and interact with the environment.