>Is anyone using Thomas wolfRAM's boot selector, OS Boot Select aka
>os-bs, with NetBSD 1.0 (or current)?

I am.  I believe I'm using 1.35 as well.  There's a newer one, but I think
the installation is the same (and if I recall, the newer one will let you boot
off of a second drive).  No problems as far as I can tell; installation is
pretty simple, you get a nice program to set everything up, and it works like
a charm!

--Ken