This could not be a better overview of the Big Bang model of the beginning moments of the universe. This is not an easy subject, so it is not surprising that it is so misunderstood. I particularly recommend Common misconceptions about the Big Bang and What does the theory really say? to get a grasp on the theory. Then glance at the converging lines of observational evidence to see why no other theory fits the data as well. I think this is fun stuff.

While I'm at it, another great popular science resource on the Big Bang mentioned on this page is this Cosmology 101 primer from the WMAP team at NASA.

Great source(s) Jason, thanks.