Oh please! I've been working with Linux professionally for almost a decade now and think I've kept pretty much on top of the interesting distributions out there. I haven't even heard of
less more than a percent of the names you mention and many of the names you list (OpenBSD, FreeBSD, GNUstep, OpenSolaris) are as much Linux as Windows is a BSD-ripoff. Just where did you conjure that list from?
And that's without really trying.
Maybe you should have tried.
If "nanny" wants to decide which Linux distribution she wants to use she's got about a half-dozen good candidates to choose from, and the decision should be a lot easier than choosing between preinstalled XP and Vista (one will run the software I want to use, the other will work on the hardware I just bought...).
I'm no apologist for MS...