When it comes to applications on tablets, developers really have to think outside the box in order to create the next addictive thing. Right now, Microsoft Research, Intel, and the University of Washington are working on the Portico, which allows the user to interact with the world outside of the tablet.
You can watch a video after the jump if you want to see a demonstration, and I highly suggest that you will. You will notice how two simple webcams can allow a stencil of a spaceship to blast asteroids on the screen. In addition to this game, Portico can also allow the player to roll a real soccer ball the size of a golf bar in order to try and get it past a virtual goalie.
What really got my attention is the virtual pet/Beanie Baby that can drink virtual water, eat virtual carrots, and even defecate in a virtual sandbox (seriously). It can even dream of its home with real life zebras. Just watch the video already!
Yes, I am seriously loving this Portico. I would imagine that the user would have to buy some apparatus in order to make it work on the iPad and other Android tablets. Unless they could be optimized for them, and if the Portico is what I think it is, these apps would be bigger than anything!