The Slice of Pi is a convienient 3 in 1 product. In addition to being a small break out board for the Raspberry PI pins, it has also a socket for a wireless module and a small prototyping area.

• XBee style connector for XRF / XBee / RN-XV etc (the easiest way to add wireless to you Pi)
• SPI and I2C pins to a standard 2.54mm pitch 8 way header (fast and easy access)
• GPIO pins to a standard 2.54mm pitch 8 way header (fast and easy access)
• Construction is very easy (suitable even for children with basic soldering skills)
• Featured in popular publications (good base of knowledge around the board)
• Easy to connect to 3v3, 5v0, GND, RX & TX (solder pads give fast access)
• Available worldwide (many people now stock the board)

Features:

• Gold plated finish (Protection against oxidization means your device will outlast normal HASL boards)
• Comes as a complete "self solder" kit of parts
• Upto 50ma at 3.3v can be drawn by the project or radio (do not exceed 50ma)
• Has a pad to connect the XBee shaped device's SLEEP pin (pin 9)
• Can support OTAMP (over the air micro programming) to another XRF family device that supports it (requires modification to AVR dude files)
• Can be used to upload firmware to the XRF
• Made in the UK

Documentation

Projects

A review of the board - http://www.doctormonk.com/2012/08/review-of-raspberry-pi-prototyping.html

http://elinux.org/RPi_Expansion_Boards#Slice_of_Pi

http://www.doctormonk.com/2012/05/gpio-led-blink-from-python-using-slice.html

http://goo.gl/wnIVS

http://blog.thiseldo.co.uk/?p=689