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Leopard Technical Notes: Darwin
The Mac OS X kernel is the fundamental layer of the Mac OS X operating system. This environment includes the I/O Kit, the Mach kernel, and a BSD personality layer. Apple discourages developers from programming in the kernel, because kernel bugs can reduce the stability of the entire system. Many device drivers can be written entirely in user space and should be, where possible.
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Kernel Core Dumps (HTML)
TN2118: Explains how to gather and use remote kernel core dumps.
 2008-11-12
Understanding and Debugging Kernel Panics (HTML) (日本語 HTML)
TN2063: Addresses kernel panics: what they are and how to debug the code that caused the panic.
 2008-08-14
Kernel Authorization (HTML)
TN2127: Describes the kernel authorization (kauth) subsystem and its associated KPI.
 2007-01-16