Mac OS X Snow Leopard offers a slew of hidden features and lays the groundwork for big advances to come. Snow Leopard is Apple’s latest operating system release, making this the seventh version of Mac OS X (eighth, if you count the two versions of 10.4 “Tiger” that bridged the PowerPC-to-Intel transition). On sale for $29 beginning tomorrow, Snow Leopard offers slimmed-down code, a smaller footprint and a raft of under-the-hood technologies designed to bring additional stability and performance. It also lays a strong foundation for the future.