Hey all - I just posted up my instructions on using the SmartThings Arduino Shield with a cheap relay to control your garage door on the projects page.
Take a look - would love some feedback on it if you see anything that isn’t quite right about it. It is my current setup at home and is working great. I tried to be as clear with it as I could - to make it as easy as possible on anyone who would like to use it in their home.
Also - huge thanks to Andrew at SmartThings for his help on it!