Meet Tinylab: an open source solution that lets you prototype like a pro. It has an Arduino and various components for you to get started faster. You get buttons, LEDs, a buzzer, Bluetooth support, USB, and various sensors. To get started, open the device, plug in the USB cable, upload your code, and you are set.
Tinylab is compatible with Linux, Mac, and Windows machines. You get various development environments to choose from (Eclipse, Codebender, Arduino). Seems like an interesting kit for learners and makers. More information is available in Indiegogo.