The first relevant-seeming presentation is from 2009[1] and doesn't really get into the pitfalls of low-latency switching/handling like this article does.

I'm definitely interested to see how other operating systems handle this, though. In particular: Windows (is networking in user-mode?) and Solaris-likes.

1 http://quigon.bsws.de/papers/2009/eurobsdcon-faster_packets/