Thought I might as well start a thread here which I'll update with my progress.
My game Positron is a 3D arcade racing/puzzle game which pretty much everyone likens to Tron (which of course was the inspiration for the game):
This latest trailer shows a few new camera modes I just added and the first person camera view specifically for trying with the Rift. I've only had my Rift for six days though and I don't feel comfortable enough yet to even try Positron with it!
In the next few days I plan to try it out (with a nice slow bike and an easy level) and I plan to post a demo which I'll link here for others to try out