We've been following articles and build projects that utilize the Arduino for quite some time, but didn't really grok it's usefullness and popularity, probably because it doesn't seem to be readily available here (might be a great opportunity for some local hobby electronics distributor). Honestly, we're not even sure how to correctly pronounce "Arduino".
Now, thanks to detailed tutorials like the one below, and the fact that we have an absolutely killer idea for a robot themed Christmas window display, we've joined the Arduino bandwagon and have some boards on order.
More on our Christmas robot project soon - as soon as some of the parts start to arrive and we can start hacking together the prototype...
Arduino, and why it matters