Yes, it progresses well, I think. : )

I just have to struggle with some vector madness in the steering behaviours ATM.

very nice
renny

Could you perhaps extend this with boxes? Say, whether or not two boxes collide, or if one box is inside another, or even with spheres, lines and points...

I can do that - at least for AABBs.
Intersection tests for OBBs are apparently pretty complicated. Have to see if I can accomplish this.

Both would be a grave help! It would be great if you could implement both, but AABB only would suffice for many problems I usually encounter already .