I live by the Unix philosophy, so one simple tool that does one thing very well is how I roll.

I could literally see myself on the command line typing

pdf2mm -i report.pdf -o report.xml -f "sales, drivers"

where -f is a list of strings to direct focus (seed the "centre of the map")

Dump .xml or .opml

Get this right and you'd have no problem offering that as a paid Web service and throw the cmdline util out there for free please. :)