This is another step towards cloud computing... soon you'll just need the monitor at home and a high enough internet connection and all the storage and computing will be done elsewhere.
I looked into the evga portal, it looks cool but it is very expensive, especially if I would want to "broadcast" the computer screen to several monitors. It seems that you get away a lot cheaper with a KVM extender.
Regarding gaming and such; this is not a very good idea since the latencies will considerably affect the interactivity of the system even though it uses udp with lower overhead than tcp.
I'm a bit skeptical. Even 1 gbit ethernet would only do ~100 mbytes/sec. If you have 3 clients connecting to this...would it just be as slow as an IGP anyways?
So is this card the equivalent of drinking a milkshake through a coffee stirrer? If it works, then very cool...but seeing is believing.
Don't forget that the guy ran the graphics over a less than 100ft gigabit LAN cable, and not over the internet.
Over the internet the performance will drop drastically, and lag will increase!