Simulated evolution of dark matter supports Parallel Dark Matter
This is going to be a short one. I just read a link that tends to support PDM. The story was actually out a few weeks ago but I didn't find it until just now.
Dark matter is similar to that of visible matter. ScienceDaily. Retrieved August 17, 2011, from http://www.sciencedaily.com/releases/2011/07/110721102021.htm
A team of astrophysicists and cosmologists found that "large cosmic structures made up of dark and normal matter evolve along the same lines."
PDM predicts this, and most other dark matter theories don't.
M. Demianski, A. Doroshkevich, S. Pilipenko, S. Gottloeber. Simulated evolution of the dark matter large-scale structure of the Universe. Monthly Notices of the Royal Astronomical Society, 2011; 414 (3): 1813 DOI: 10.1111/j.1365-2966.2011.18265.x