I played around with it yesterday and I already got a few nice things working...
I added some kind of fog. Now things that are close are visible and the greater the distance the the camera, the darker the things get... this add a bit of spooky athmosphere.
It runs very nice on my 80GB Zune, and I don't think the 80GB Zune has another processor than the 8GB. I will definetely use this engine for some kind of small game in the near future
(and I already know what game I will do)
Great stuff so far Nick.