For a company known for breakthrough products with cool features, Apple this week is doing something unusual: It is introducing a key product with very few new features that are visible to its users. This new release, the latest major version of the Macintosh operating system, looks and works almost exactly the same as its predecessor, but has been heavily re-engineered under the covers for greater speed and efficiency, and to add future-oriented core technologies. The new software, called Snow Leopard, succeeds Apple’s 2007-vintage Leopard, which I regard as the best computer operating system out there, and markedly superior to its main rival, Microsoft’s Windows Vista. Snow Leopard goes on sale Friday, Aug. 28, and will be pre-installed on all new Macintosh computers. Continua…