I have come up with a simple solution to the dreaded Create Street Index. Just read the README to see how it works. I do hope this helps. I just wanted to thank you for posting this, I had been looking for just such a tool and this works great for me! I wanted my street index to match a reference grid I had on my data frame. I discovered that I needed to be sure that the Alpha characters were on the rows and the Numeric was on the columns first to match how your tool works. I figured out what size I wanted my reference grid cells (3"x3") to help with creating the grid. I used data driven pages to create my grid using the coordinates of the lower left corner of my data frame as the starting point and the size of each "grid cell" to match my reference grid (3"x3"). Once I had my grid, I ran your tool to get my street index. Very nice!
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