How many toy guns of all sorts of shapes, sizes, colors, uses are there? ..caps, water, nerf, dart, BB...
I'm surprised we haven't seen something like this come out sooner, Nerf modified their product to "dual-use" it for a Nintendo Wii controller holder! I've already got a handful of those laying around my house, if I got a Wii, I wouldn't hesitate to get one that could fit a controller that my kids could play with outside when they aren't inside playing.
I think that companies that find innovative ways to make their products fit with new ideas and keep themselves injected into evolving experiences shows that they have what it takes to recognize how what they make can fit into the user's lives to actually add value.
Garmin's super cool Nuvi phone is another prime example! Taking their expertise in GPS/UI and laying down on a super cool touch screen phone really adds a layer of convergence that I'd be more than happy to get my grubby hands on.