Well done! You might want to work a bit more on the mechanical side but as long as it does the job... I like your documentation on the website as well. So what's next? Your homepage says xbee (RF?) and bluetooth communication, why both? What are your plans with it? It'll be nice to control it through a web interface and get feedback from that wireless camera you have installed!
Regards,
Till
ps: your molecubes project reminds me of this post I read today http://blog.makezine.com/archive/2008/04/shapeshifting_robots.html