The basic summary is that since aureal died, the older X-Fi titanium HD soundcards are the most broadly compatible option for PC surround. And then a few tips about activating OpenAL, but most of the rest of the thread is "what should I buy" and troubleshooting.
I'm personally very excited about the Occulus Rift and Sony's Morpheus concept, but I haven't bought a head-unit. I'd definitely like one compatible with the headphones I already have, and honestly I'm not excited about screens on top of my face. However, I really do enjoy virtual surround now, to the point where I miss it when it's not there.
Apparently the PS4 has AMD's TrueAudio dedicated audio processor, I'm hopeful it will also be used to support 3D virtual surround for headphones. That would be a big gain for exposing the masses to surround.