Adafruit Arduino Proto Screw Shield is a dual-purpose prototyping shield. The shield has a large grid prototyping area but it also extends the Arduino pins to sturdy, secure, and dependable screw terminal blocks. You even get a few bonus terminals for extra GND and four 'free' terminals for whatever connections you wish! The R3 update to this design brings a stacking header for the ICSP 2x3 pins and breakout the SCL and SDA pins. It now works much better with R3 Uno's, Mega, Leonardo, as well as stacking nicely with any shield.
The stack-able wing design of Adafruit Arduino Proto Screw Shield allows you slip this under any shield and still get easy access to the "analog" & "digital" ports of the Arduino. The ScrewShield can be stacked above or below pretty much every other shield.
Adafruit Arduino Proto Screw Shield comes as a kit of all through-hole parts. You'll need to assemble the kit using a soldering iron, diagonal cutters and solder but it’s an easy kit and should take less than half an hour.
Adafruit Web Site: https://www.adafruit.com/product/196