If you've ever struggled to use a solderless breadboard with an Arduino, you understand how frustrating it can be!
The BoArduino is a clever layout that clones the open-source Arduino,so it straddles the center row of a standard breadboard. This lets you easily prototype your own Arduino-type circuits in a convenient way, unlike with the standard Arduino, which doesn't fit on a breadboard.
Unlike it's close relative (the standard "DC Boarduino") this one has the FTDI chip and USB-B jack built right on - no funky USB converter cable required! On the flip-side, it does not have a DC power jack, meaning it's going to pull power from the USB port.
Here's what it offers:
Get more info at the USB Boarduino webpage.