There's a nice little kerfuffle going on in the Science Blogs about a piece in the New York Times in which the cosmologist Paul Davies stubs his toe in the philosophy of science. As usual, Wilkins has an excellent analysis, which in this case demonstrates that Davies is guilty of at least two logical errors.
"Victor Stenger at Talk Reason* makes the argument that a single universe runs afoul of Occam's Razor by postulating an arbitrary and unnecessary limit of 1 to the number of universes. That limit itself is the unparsimonious entity. After all, we have the existance of one universe known - more than one isn't multiplying entities, it's repeating a single entity that is known to exist in at least one case..."
Maybe the various detectors on the Large Hadron Collider, in the final stages of construction as we speak, will shed some light on the present paucity of data for both string 'theory' and multiverse scenarios. Right now, their main scientific virtue with respect to origins is not that they 'explain' anything, but that they in principle supply a naturalistic redoubt for cosmogenesis. In the meantime, we do have one universe known to exist and we do not need to posit a theological redoubt in order to ask why it has the properties that it does.
* I should point out that Stenger's article is a good read, well worth a person's time, and it has a lot more in it than just the argument I reference above. For the record, the link takes one to a PDF file, and one can find Stenger's discussion of parsimony with reference to multiverse scenarios beginning on page 17.