This is the most interesting topic i see here since the beginning of 2011. At least, this is something useful and mind-challenging.
Regarding your topic, YES, i recently bought a 4x4 Rubik Cube. Couldn't solve it so far (i tried couple of times, for 30 mins each). It is indeed a mind challenging game.
I'll definitely be looking for some algorithms to solve Rubik Cubes. And hopefully, i'll be able to solve this cube soon.
And btw, have you ever asked yourself, why it's called Rubik. Of course it's named after its inventor Ernő Rubik.
You might also want to take a look at the
Mathematics behind this cool toy.