I have no information on the negabinary counting system, but I have noticed that every time someone uses an odd numbering system, it is because there is a benefit for certain kinds of operations. This is exactly the reason we can all count in octal and hex - they line up on byte boundaries, so we can conveniently represent the binary data in a form we can deal with.

What benefit do you get from using negabinary? Try a few operations and see if any patterns fall out. Try left shifting and right shifting numbers. What happens when you mask numbers with an and? Do the numbers cover a more convenient range? For what applications is it more convenient to count from -170 to 85?

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Jeremy
I didn't believe in evil until I dated it.