Another XNU/MacOSX article
What Is Darwin (and How It Powers Mac OS X) seems to be another article about MacOSX which didn’t offer any new insights into why Apple continues to use it instead of FreeBSD, despite all the performance criticisms levelled against it recently by Anandtech.
Also, both Apple and Sun seem to have very little understanding of how to compete against Linux (hint: Single CD distro which people can recompile from scratch including the kernel)