Cement board and its different configurations have become the largest selling siding product in the country at this time. It comes in 4x? size sheets, shake shingle look, lap siding, and stucco sheets 4x?. It has some limitations such as how close you can be to the ground, and its proximity to high moisture areas (i.e. dormers, etc.).
Here's some examples of cement concrete board siding we've used in our projects.