I have already pointed out how German language books dominate in LaTeX and now I have found another area where German-language books suggest that the Germans are well-ahead of English speakers in their use of FOSS.

I can find three books on kernel virtualisation (KVM) in German:

KVM kurz & gut

KVM Best Practices: Virtualisierungslösungen für den Enterprise-Bereich

KVM: Grundlagen und Praxis kernelbasierter Virtualisierung mit Linux

(Strangely, though, none of these seems to be presently available.) In English there is only a technical report for Fedora 12 -Fedora 12 Virtualization Guide – though, admittedly, it would appear to be in print!