That looks great

I noticed two things while moving through the enviroment:

> Somehow the camera control with the mouse works annoying.
If i want to turn my camera, my mouse cannot go further to the left/right.
I should make it more sensitive.

> The occlusion culling system has some glitches. When i walked into a "dead end" and managed to look back, i saw a large black gap just around the corner. You should take a look at this.

But i do like the bumpmapping very much.

It works on my system:

Vista Ultimate
AMD 64X2 5400+
2Gig RAM
Geforce 8600GT

Good luck. Hope to see more of this.