Mac OS X 10.6: Quartz Composer 4.0 Hands-On Review, New Features Ed.: Many of Snow Leopard’s improvements – new, under-the-hood enhancements for 64-bit and multithreading – don’t impact visual creation right away. But significant changes to Quartz Composer could be the most useful, most immediate reasons to look at the latest version of Apple’s OS. Resident Mac guru Anton Marini looks at those cha