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Mitchell_Porter comments on How accurate is the quantum physics sequence? - Less Wrong
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And, subordinate to those three, the point that Occam's Razor applies to code not RAM (so to speak). Worth mentioning since I think that's the part that went over shminux's head.
I think the supposed Occamian benefit is overstated. E.g., the transactional interpretation has an Occamian benefit in that you don't asymmetrically reject advanced wave solutions to Maxwell's equations, and yet I don't see anyone telling me that therefore the T.I. is obviously correct. Mirror matter: predicted by fundamental-ness of supersymmetry, Occamian benefit, still highly speculative. (Don't have a PhD in physics (dropped out of high school physics), only felt justified in replying to wedrifid because AFAIK he doesn't have a PhD in physics either. Someone with domain knowledge, please correct/refine/embarrass my point.)
Mirror matter comes from "N=2" supersymmetry, where along with the usual particle and its superpartner, you have a mirror partner for both of those. Ordinary "N=1" supersymmetry doesn't have the mirrors. N=2 supersymmetry is of major interest mathematically, but it's difficult to get the standard model from an N=2 theory. But if you did, the mirror matter might be the dark matter. It's in my top ten of cool possibilities, but I can't say it's favored by Occam.
I'd be interested in reading more about your top ten cool possibilities. They sound cool.