As this article In the New Scientists entitled "Last-gasp test could reveal dark matter" on Jan 28, 2007 http://www.newscientist.com/channel/...rk-matter.html indicates almost all efforts to determine the composition of dark matter have revolved around looking for a particle that can explain its properties.
"The HERA particle accelerator in Germany is set to call it quits in June, but a lone physicist is now campaigning for HERA to have one last hurrah. He claims it could discover a particle believed by many to account for the unseen dark matter that constitutes the bulk of the universe's mass."
However is it possible that the reason we have not yet discovered the composition of dark matter is because it is not made up of a particle but of a continuous non-quantized form of mass.
Jeff
http://www.sflorg.com/imagineers/?p=12
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