My son is playing with his new iOS controlled toy, Sphero 2.0. See-through version is available in Apple Stores exclusively. This robotic orb connects via Bluetooth and works with both iOS and Android devices. It also has an Open API which «allows virtually anyone to program new games and apps for Sphero»
And of course, you can download some cool apps onto your iOS or Android phone. Here you can see the augmented reality app Sharky the beaver. Very cool to watch the yellow beaver running around in my living room looking for cupcakes!