Arduino Breadboard Shield
Works with the Uno! This prototyping shield is the best out there (well, we think so, at least). It works with UNO, NG, Diecimila and Duemilanove Arduinos.
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 on either side for extra power stability