A stability datapoint: Around January 2006 I installed a dom0 and a
few domUs, all running NetBSD-current at the time.  Until there were
power issues in December (failing UPS), the dom0 and domUs stayed up
and worked fine.  So I think NetBSD is a good choice from the
reliability viewpoint; netbsd-4 should be even more reliable since
lots of bugs are fixed since the version I ran.

-- 
    Greg Troxel <gdt@ir.bbn.com>