This will probably be required reading

search
I downloaded it as an iPod app for 4.99. The index doesn't work on the ipod, but I bet it does on the Kindle edition. There are no page numbers, and the subheads are blue link-looking text, so I would bet that Peter Morville understands that indexes must be alive. I hate reading on a teeny screen, but for 4.99, heck, that's a deal.