On his blog today Dave asks for an app that generates an index of a blog (or really a web site). I would like something like that too, and I have something similar on my wiki but that is just an index of page titles not an index of phrases or words written in a site. Back when I wrote my books I had to pay someone to create the index for the book. I assume then that was a person who used a tool to automatically produce an index of the book’s content but then manually reviewed and edited the output to produce the final product. Not sure the production of a good index can be completely automated, but an automated one might be good enough.