Apple released today a highly recommended security update 2009-001 for all versions of MacOS X. This updated improves the security of Mac OS X and fixes various operating system flaws. The security update is available for MacOS X Leopard, Leopard Server, Tiger for Intel Macs, Tiger for PowerPC-based Macs, Tiger Server for PowerPC-based Macs and Server Universal. In addition Apple has released two Java security updates that improve the security and compatibility of Java on MacOS X. All updates can be located and installed via Software Update or directly from Apple Downloads here. More information about the updates can be found here.