Hello everyone! I created an obstacle detector a few days ago which uses a webcam and a laser pointer to approximately determine how far an obstacle (for example, a wall) is from the camera. Check it out on myblog . If you can't see it on my blog, try http://ashishrd.blogspot.com/2006/11/obstacle-detector-using-webcam-and.html . Hope you find it interesting. :)

Ashish