OpenSSH-HPN's patchset really needs to be merged into the mainline. There's no excuse for not at least incorporating dynamic window scaling into the core protocol since it's such a ridiculous omission at this point.
From a quick look I didn't see any license associated with these patches.
Searching around on the -misc archives, djm claims performance improvements similar to HPN and declares no interest in implementing the NONE cipher(no encryption after authentication).
