Cool new Unity demo: http://rustltd.com/news/adventures-in-virtual-reality
Definitely check this out if you've got a Rift. Its a lot more impressive than the Tuscany demo.
When the Rift's finally start getting into more hands, I could see a lot of pretty impressive Unity demos coming out. People can't monetize them without the $1500 license, but I think a chip-in or paypal donate button on their tumblr or whatever would be in order.