Check it out here: http://kanelynchsucks.com/sfsr/rot_cube.html
(glory to Tzahi for hosting it)
Edit: The page is currently unavailible. If you're interested, email me and I'll send you a copy.
Please note, this cube is not really 3D. I just hacked it together using a couple of tricks, which I think are rather clever.
My next post (or more) will explain thoroughly how I made the cube and the tricks that I used. But I highly recommend you, the readers of this blog, to try and figure it out yourself. It can be a fun exercise. The actual code is very readable, and the only mystery is - how did I do it?