Random walk applet from this group
In the following talk the effect is called"The Coherent Backscattering Opposition Effect (CBOE)"
Here is an application to astronomy from the same conference
Interesting paper on "Magnetic field effects on coherent backscattering of light"
Good web site describing a student experiment(but the results are doubtable)
Another important person in the field is Paul Saulnier (P. M. Saulnier) at the University of Delaware.
His papers are listed here