Hi,
For those new to the FreeBSD kernel, but familiar with the Linux kernel,
the following quick overview comparison might be useful:
"A comparison of Solaris, Linux, and FreeBSD Kernels" by Max Bruning
http://www.opensolaris.org/os/article/2005-10-14_a_comparison_of_solaris__linux__and_freebsd_kernels/
Drew Daniels
Resume: http://www.boxheap.net/ddaniels/resume.html