Take a look at this mod that brings Oculus Rift support to Quake 3. This is a gamer driven mod (Densohax), and will likely improve once the Oculus SDK is readily available. For example, it doesn’t have head tracking yet; but give it time! You can check out the full thread in our forums.
MTBS is getting ready to try some new things this year in preparation for the Rift and similar VR devices, so remember to join our Facebook and Twitter pages. This will go a long way in some big ideas we want to bring to fruition. Thanks in advance!