Apple has released iTunes 10.4 which supports full-screen mode and 64-bit cocoa under Mac OS X Lion. iTunes however remains 32-bit under Snow Leopard.
You can now use iTunes with OS X Lion’s new Full-Screen App capability, which allows you to use iTunes and other apps without distractions. Navigate between your full-screen apps with a simple gesture.
Note: iTunes is now a 64-bit Cocoa application on OS X Lion and includes a number of important stability and performance improvements. Some iTunes plug-ins may no longer be compatible with this version of iTunes. Please contact the plug-in developer for an updated plug-in compatible with iTunes 10.4.
Apple also releases iWork Update 6 which adds support for Mac OS X Lion’s Full Screen Mode, Resume, Auto Save and Versions features.