I think the number of sales per day a month or so after launch with give us all a bit of insight about whether we like the ideas at ted.com or the way they're conveyed. I think the ideas and stories TED has brought me are invaluable and some people I've seen give TED Talks are actually genius, but I don't buy just anyone's book. Then again, they are just $2.99.
I know TED are not in the crapper with money, so this thing might actually be new for the sake of novelty science.

The first three TED Book are up for sale and can be downloaded on any Kindle-app-equiepped device, including iPhones -- you know, like mine.

I think I'll start with The Happiness Manifesto, by Nic Marks, because I remember I loved the talk.

http://www.ted.com/talks/nic_marks_the_happy_planet_index.html