FYI, Less.js isn't just a javascript port. It adds new features, and the "&" selector is among them. That said, I agree that SASS is more mature. I've used e

FYI, Less.js isn't just a javascript port. It adds new features, and the "&" selector is among them. That said, I agree that SASS is more mature. I've used each on at least two projects now, and, with the release of SASS 3.0's and SCSS, I'm committing to SASS. This client-side parsing is a cool trick, but it's easy to do my CSS generation at the same time as my javascript minification. I just don't need it.