I just saw an article about the new Esplora product. It looks quite fun, even with the severe I/O limitations of the design. One thought for a future addition: Why not integrate something like an XBee compatible interface, or allow that type of expansion? I'm playing with an Arduino controlled quadcopter project right now, and have done a few other little radio control projects where I used an Arduino. The Esplora could be an amazingly simple controller platform for some of those types of projects, with just a few tweaks to allow a bit more outside communications.
Just something to think about...