What an exciting day! I got my Digispark Arduino board the other day. I kicked in on Kickstarter for the reward level with two boards plus a few accessories. Everything is just as described in the pitch and I couldn't be happier. This is a tiny board at an equally tiny price.
It was $21 for two devices, and should be $8/chip in quantity in production. I can use the Arduino IDE, and power it directly from USB (or AC/DC USB charger adapter). It has six inputs/outputs, onboard LED, and supports emulation for mouse/keyboard/joystick with almost no effort. It's really an amazing little device and if you like hardware hacking, you need to get yourself one now.
So far I've done some simple keyboard prank stuff, the blinking light ("hello world" of Arduino I think), and done a pulsing buzzer. I have a cheap Bluetooth module and I plan on creating a simple interface from our treadmill to computer/phone. It's cheap enough to do that kind of thing!
Did you get one? What do you think?