While saying this, I feel like this was the GMAT, and this audio a analysis of the essay thing. I felt that towards the end the objective of this "preview" was to draw people's interest into buying the rest of the essay, clearly enough that is the objective of any preview. But to me, I would say, it failed in drawing me, because:

1. The audio only established the set-pieces but didn't actually even gave the glimpse of the whole essay, what I did get a glimpse of was the highly rhetoric sense in which it was presented.

2. The audio ended abruptly, at the world literally, meaning, it was a half effort at making an audio preview, and there was no quality check, which I would expect, if the site is not that popular.

In one sentence, I'm interested to know what truth is, but I wasn't actually given a glimpse of his views on truth.

Apart this, I would like to wish them luck in their efforts, seems like a good platform with a unique approach to podcast. But somehow I felt, that it would take more than that to draw me (a last.fm fan) just yet.