Apple has announced Mac OS X 10.6, a new version of the Apple Operating System. This version only has some under the hood enhancements, and is therefore much cheaper for current 10.5 users. It can now be pre-ordered in the Online Apple Store, and will be delivered on August 28. It can also be purchased in Apple Stores and resellers from that date. I've listed the prices for each version, as it could be confusing: Snow Leopard only runs on Macs with an Intel CPU. The PowerPC CPUs are not supported anymore by this version. You purchased a Mac on June 8 2009 or later Upgrade to Snow Leopard: $9.95 You have 10.5 "Leopard" installed: Single User (1 Computer): $29 Family Pack (Up to 5 Computers): $49 You have 10.4 "Tiger" installed: Mac Box Set, including iWork '09 and iLife '09 is the only option. Single User (1 Computer): $169 Family Pack (Up to 5 Computers): $229 Mac OS X 10.6 Server will cost $499 for unlimited clients. You can read the information about Mac OS X 10.6 on this page. Information about the server edition can be found on this page.