Did you guys try to move to haml/sass from the existing view templates/stylesheets? Would like to know if you guys had good success rate moving to haml on a big existing project...
Looking through our git logs, I believe early September is when we really started to look at Rails 3 in earnest. We landed the branch in the second week of November. The code work was a solid month plus, and we spent nearly as much calendar time, and probably more actual person-hours, in testing and fixing thereafter.