In 2012 I was working on a few PCB designs and opened a website focussed on those designs. I didn't add more in the past few years though, so also due to costs of internet domains, I migrated (and kinda archived) this back to my own website.
Below you'll find the designs and all related content.
This board breaks out a few pins for using an XBee, 4 servos and SPI devices.
The nice thing is, if you don't use any of the components on this shield, you can still use those pins somewhere else; it just breaks out a couple of pins in a nice way.
More info: http://fritzing.org/projects/xbeeservospi-shield/
This board shows how easy it is to multiplex generic purpose output ports with the 74HC595 IC and daisychain them.
The 6 pin interface is compatible with the SPI header of my "XBee + Servo + SPI Shield" design.
More info: http://fritzing.org/projects/gpo-breakout-board/
This board is designed to hack the Netduino Go! and it's modules.
More info: http://forums.netduino.com/index.php?/topic/3807-netduino-go-hacker-board/
Design files: Netduino_Go!_Hacker_design.zip (120kB)