That looks very cool. Now I just have to decide if I want to risk customs here (U.S.A. customs seems to be very seize happy lately).
My only thought on that shield would be to get the power via the ISP connector (that's possible, right?) so it can be stacked on shields that block the power header (like the XBee shield for instance).
A minor point still in favor of the sparkfun product is that it has some useful extras on it like a buzzer, a relay, and a OneWire port. Still, you loose the ability to use shields with the sparkfun design, but there are plenty of Arduinos/freedruinoss/boardruinos/etc that don't accept shields. If Sparkfun slapped an XBee socket on their design, and made it Arduino compatible, it's be an excellent Arduino/Freeduino. (TerminalDunio?)
Just my thoughts though.
Now to debate if I want to brave international shipping to the U.S.! (Sparkfun/nkeelectronics/ladyada/etc, you listening? If you make an LCD/Button shield like the one Oracle linked, I'm sure you'd have lots of people wanting one!