Below is a list of external resources on VR recommended by Unity. As this is a new medium, the articles would be dated where appropriate so that you can see when they’re from, and draw some assumptions about the timeliness of the content.
The Unite conferences are held several times a year around the world, and have insightful talks about many topics, including VR.
Here are the VR-related talks from the recent Unite conferences:
The Oculus Connect conference is held every year, and is where “engineers, designers, and creatives from around the world come together to learn about the future of the Oculus platform and push virtual reality forward.”
Here are links to YouTube playlists of the developer sessions:
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