Check out these awesome specifications:

• It has a nice standard 0.1″x0.1″ prototying grid with big pads
• Comes with Stacking headers and plain header, choose whichever you want when soldering together
• A IC pattern for adding DIP ICs up to 20 pins
• Power rails down the middle and sides
• A reset button and an extra general use button
• 2 3mm general use LEDs, red and green, as well as 2 matching resistors
• A pass-thru ICSP stacking header so you can stack any kind of shield on top, and/or use an AVR programmer
• A surface-mount chip area for up to 14 SOIC size parts
• Compatible with tiny breadboards
• Every pin is brought out!
• Gold plated pads
• 2 x 0.1uF capacitors on either side for extra power stability