This prototyping shield works with UNO, NG, Diecimila and Duemilanove Arduinos. You can use it with a Leonardo but it will not break out the hardware SPI pins (they're only on the ISP connector underneath) or the IOREF/SDA/SCL pins. However, the SDA/SCL pins on the Leonardo are also on digital #2 and #3 so you can still use them by connecting to #2 and #3.

Check out these awesome specifications:

• It has a nice standard 0.1"x0.1" prototying grid with big pads
• 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
• The ICSP header is up top if you like to upload to your Arduino using a programmer
• A surface-mount chip area for up to 14 SOIC size parts
• Compatible with either tiny breadboards or 'standard' breadboards with the rails removed.
• Every pin is brought out, including the new 3V and Reset header pins
• 2 0.1uF capacitors additional footprints on either side for extra power stability

Note: Default version does not support stacking additional shield on top