Apple’s second beta of its Mac OS X 10.6.2 update hit the developer circles recently, the new build incorporating numerous fixes for a wide variety of issues.

Sources familiar with the latest build, dubbed 10C519f, said the update addresses nearly 150 “general focus areas” ranging from applications like Address Book, Photo Booth and QuickTime Player to core services including Front Row, Spaces, and Time Machine.

The update also specifically targets WWAN support for mobile data services and enhances Exchange support, MobileMe and iDisk features, as well as NTFS and WebDAV file system support.

The new beta also addresses specific issues related to the app switching in the Dock, performance and stability issues tied to graphics drivers and the OpenCL compiler, as well as patches impacting bugs in Parental Controls Preview, printing, and the software update mechanism itself.