‘Atomic’, January 2009 issue, has a good tutorial about details and advantages of ZFS, the kernel-level filesystem in OpenSolaris, BSD and MacOS, and how it compares with LVM (Linux Volume Manager) for disc data integrity and so forth.
In the same issue there is a set of in-depth tutorials on network security: in storeage, wireless, and the Linux OS.
And if you want to try OpenSolaris itself (which is a type of Unix, but now comes with bash) there is a CD on the cover of ‘Linux User & Developer’, Issue 78, just out now.
‘Linux Magazine Jan 2009′ has a good article exploring Debian’s implementation of the draft 802.11s standard for wireless meshes. a formal extension of ad-hoc networks.