I know Morris Dovey has had his Super Zero mentioned on the forum here, that's where I learned about it. However, I think the threads are dated/archived so I wanted to make a note here for anyone looking for an innovative and versatile zeroing solution, you gotta check it out.
For complete details and ordering go here...
http://www.iedu.com/DeSoto/SuperZero/
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I have been using the Super Zero for about a week and it works great. I have C1 for zeroing XYZ to the corner, then C2 for the standard Z-zero routine in case I just need to zero z. I changed the setting in "shopbot setup" to .5" for the Super Zero plate thickness. It all works perfect.
Morris is a great guy and if you happen to have an hour or so, start clicking around his website for some great reading about other things as well. He is big into developing Solar Heating solutions for your shop or home.