Stefan, One thing that was v useful about mod_spdy was the insight on what changes/re-factoring might be done w/i the core httpd code itself to make things easier, such as the idea of a "slave" conn_rec (or a virtual connection). I started trying to fold some of that into trunk, and so any insight you may have from your mod_h2 work would be MOST APPRECIATED. I think we can abstract out enough that we would not need a wholesale re-write of large chunks of the core.
I also think that Serf and even APR would also benefit from that as well.
