The raysensor is (hopefully) fixed in the current gameengine. Please check out this binary (win32):
Also, for the ones who downloaded blender 2.40 alpha2, you can play with bullet physics in the gameengine / keyframe baking with there sample files:
Obviously Jorrit and the Crystal Space project is the future for the blender gameengine, but in the meanwhile I will add some physics-related toys in the current Ketsji gameengine, and hopefully apply some donated patches (blender-material/multitexture etc.).
The first toy will be vehicle support for the gameengine. The vehicle is based on Bullet rigidbodies. The physics-vehicle would be using raycasts, a simple tyre-friction model and a suspension (spring-damper). It could already be done in python, but the planned one is a basic built-in vehicle.