Tried sshfs 5 or so years ago, rejected it because the crypto overhead prevented me from filling a 100 MBit link. I should probably try it again since that won't be a problem nowadays.
I only mentioned DRBD to illustrate how desperate I've become! It was actually pretty good except that I couldn't get the split brain recovery to work the way I wanted. So close and yet so far. Haven't gotten desperate enough to try AFS yet!
Why doesn't 9p or webdav or some simple protocol take off? It's amazing to me that NFS and CIFS are still state of the art. I guess I don't understand the trade-offs very well.