ThinkSecret notes that Apple has seeded Mac OS X 10.4.6 to developers one week following the official release of Mac OS X 10.4.5.
The update currently delivers about 50 documented improvements, including several OpenGL-related fixes, improvements to CoreImage and CoreGraphics, and other bug corrections for iSync, AppleScript, and other components. Known issues with the update include certain AppleScripts not running correctly and Safari hanging in some situations
The update comes in both PowerPC and Intel flavors.