We got two rifts this last week. They really are incredibly immersive. First law is definitely on my list to play - we just didn't have an extra controller around the office. Some other good ones are the Unreal Dev Kit (seems it needs a special build though) and another called Titans of Space.
That will be amazing - I was just reading your blog earlier - I like how you're going about things and it really seems you're on a great track. Let me know if you need a beta-tester! Keep up the good work.
