Just how many universes are there, anyway?

As usual with Balticon, I came up with the title before figuring out the talk.  This year it is:

Just how many universes are there, anyway?

Why do many physicists think there may be an infinite number of universes?  What would they be like?  What might life be like in parallel universes? How might we detect them?  Could we travel between them?  And what does quantum mechanics have to do with the multiverse?
This will be at my favorite time slot, 2pm Saturday (the 23rd of May this year).  Now all I have to do is whip up some content.  Would I were in one of the infinite parallel universes in which I have already done so!

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