Hum,
an interesting podcast - but naturally very generalised - perhaps if you get the chance do a follow-up (ie podcast 5, the industrial strength version for nerds), you could go into more detail about the events leading up to the last scattering surface; it would answer a lot questions that seem to recur on the forum.
Nothing too scary; just the simple history and mainstream views - Hawkings proposal of a blackhole, GUT theories, Andrei Lind/Andrei Sakharov antimatter/matter, symmetry breaking, inflation, etc...

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`Irony` actually does mean `metal like`...