BBC Radio 4's consumer affairs programme, 'You and Yours', had an item on ebook pricing today.
They pretty much covered points that have already been discussed here; but if anyone wants to hear it, it's on their podcast at:
http://www.bbc.co.uk/radio4/youandyours/
I'm not sure if it's geo restricted - the discussion runs from 08:25 - 14:30.