Hey Blue, Yes I have the 50D and also the 7D. I have been using the test chart in the links already provided (this one). I'm interested in something like the one you showed as an example though, might be easier/quicker to set up and because you're focusing at a 90degs to the camera I reckon it would be more accurate and repeatable. Having said that I get pretty good repeatable results using the 45deg method that allow me to confidently set my focus microadjust and forget about it knowing that when I'm in the field it I don't need to think about it.

Cheers,
Mic