tmpfs Summer-of-Code project
has been integrated into NetBSD for some time now under
an 'experimental' status. After discussion a few weeks ago,
author Julio Merino Vidal fixed another round of nits that
made tmpfs all good & shiny,
Julio's posting to tech-kern.
With those changes, I think we can hope to see tmpfs as
non-experimental in NetBSD 4.0.