Even dedicated Linux users should not forget the existence of BSD family of Unix operating systems. For example, Arch users might consider testing NetBSD for a few weeks, Debian users might like FreeBSD and *buntu people could well find themselves comfortable using PC-BSD.
And in case you really don't want to try living on the other side of the fence, you should in any case read the free BSD Magazine. Very often the articles are equally useful for Linux and BSD users -- and the magazine is freely downloadable!
