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The LHC is still in its teething phase. There are some signatures of SUSY already. The Higgs will prove to be difficult to detect. Its signature is comparable to other fields. It is not expected to be observed until 2013, though some results from the Tevatron are favouring a SUSY Higgs sector. Some evidence of the 2-doublet Higgs sector in MSSM has been found.
The issue with the 10^{500} vacua does involve the Calabi-Yau space, which in the trivial case is a T^6 = T^2xT^2xT^2. There are entangled states associated with groups of the T^2's which correspond to the presence of a Dp-brane. The problem is that the T^6 is sort of the ground state of Calabi Yau spaces. The introduction of singular points which transform between each other in conifold extends this to a more general set of CY manifolds. This leads to this landscape issue of 10^{500} vacua.
The question about one universe vs many comes down to the classical measure for each of these cosmologies. A large cosmological constant would correspond to a nucleation bubble that inflates rapidly and correspond to paths in the grand path integral with wildly oscillating phases. These contribute little to a classical amplitude, or any decoherent set of paths which have some WKB or classical-like content. A low cosmological constant is a small vacuum energy leve and is more likely to define some coherent set of "histories." The idea of there being some extremal condition on complexity is what I would call a condition for a decoherent history that has a classical-like content. Whether there is ultimately one of these or not is unknown. As such this would mean the grand path integral in the superspace consists of a much smaller number of cosmologies which are classical or are proximal to what we call "reality." The rest of these cosmologies are then quantum corrections.
Cheers LC